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    6 vulnerabilities by connectbot

    CVE-2026-54700 (GCVE-0-2026-54700)

    Vulnerability from nvd – Published: 2026-10-13 15:53 – Updated: 2026-10-16 22:06
    VLAI
    Title
    ConnectBot SSH: Unbounded SSH field lengths can cause excessive memory allocation
    Summary
    ConnectBot SSH Client Library is written in Kotlin with Kaitai Struct and KStateMachine. Prior to 0.3.1, the SSH protocol parser trusts attacker-controlled inner byte lengths and element counts without verifying that they fit in the containing packet. A malicious or compromised SSH server can return a small malformed packet whose oversized declarations cause the Kaitai Struct Java runtime to attempt excessive allocation or repeated parsing before detecting truncated input. The general transport path requires a client connection but no authentication or optional feature; malformed SSH-agent messages additionally require SSH agent forwarding. The issue can raise an uncaught OutOfMemoryError and terminate the application process, with no demonstrated confidentiality or integrity impact. This issue is fixed in version 0.3.1.
    Severity
    6.9 (Medium)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-16 22:05 UTC
    CWE
    • CWE-20 - Improper Input Validation
    • CWE-789 - Memory Allocation with Excessive Size Value
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7627 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    connectbot cbssh Affected: < 0.3.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-54697 (GCVE-0-2026-54697)

    Vulnerability from nvd – Published: 2026-10-13 15:54 – Updated: 2026-10-13 16:07
    VLAI
    Title
    ConnectBot SSH: Excessive allocation and integer overflow in DER private-key parsing
    Summary
    ConnectBot SSH Client Library is written in Kotlin with Kaitai Struct and KStateMachine. Prior to 0.3.1, DerReader.readLength() accepts excessive long-form DER length octets, accumulates them into an Int, and primitive readers allocate arrays without checking the declared size against the remaining input. An application or user that loads an attacker-provided private-key file through SshClient.authenticatePublicKey(), SshKeys.decodePemPrivateKey(), SshSigning.sign(), or SshSigning.getPublicKey() can trigger integer wraparound, excessive allocation, or an uncaught OutOfMemoryError. SSH server host keys and agent-forwarding messages do not use this application-supplied private-key input path. No usable weakened key and no confidentiality or integrity impact have been demonstrated. This issue is fixed in version 0.3.1.
    Severity
    6.7 (Medium)
    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-13 16:07 UTC
    CWE
    • CWE-190 - Integer Overflow or Wraparound
    • CWE-789 - Memory Allocation with Excessive Size Value
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7627 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    connectbot cbssh Affected: < 0.3.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2023-48795 (GCVE-0-2023-48795)

    Vulnerability from nvd – Published: 2023-12-18 00:00 – Updated: 2026-10-15 00:08
    VLAI
    Summary
    The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH's use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in chacha20-poly1305@openssh.com and (if CBC is used) the -etm@openssh.com MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80, AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.10.6, libssh2 through 1.11.0, Thorn Tech SFTP Gateway before 3.4.6, Tera Term before 5.1, Paramiko before 3.4.0, jsch before 0.2.15, SFTPGo before 2.5.6, Netgate pfSense Plus through 23.09.1, Netgate pfSense CE through 2.7.2, HPN-SSH through 18.2.0, ProFTPD before 1.3.8b (and before 1.3.9rc2), ORYX CycloneSSH before 2.3.4, NetSarang XShell 7 before Build 0144, CrushFTP before 10.6.0, ConnectBot SSH library before 2.2.22, Apache MINA sshd through 2.11.0, sshj through 0.37.0, TinySSH through 20230101, trilead-ssh2 6401, LANCOM LCOS and LANconfig, FileZilla before 3.66.4, Nova before 11.8, PKIX-SSH before 14.4, SecureCRT before 9.4.3, Transmit5 before 5.10.4, Win32-OpenSSH before 9.5.0.0p1-Beta, WinSCP before 6.2.2, Bitvise SSH Server before 9.32, Bitvise SSH Client before 9.33, KiTTY through 0.76.1.13, the net-ssh gem 7.2.0 for Ruby, the mscdex ssh2 module before 1.15.0 for Node.js, the thrussh library before 0.35.1 for Rust, and the Russh crate before 0.40.2 for Rust.
    Severity
    5.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2023-12-22 05:01 UTC
    CWE
    • n/a
    • CWE-354 - Improper Validation of Integrity Check Value
    Assigner
    mitre CNA under the mitre root
    CNA scorecard E 28/100 over 2348 records in the last 180 days details
    References
    URL Tags
    https://www.chiark.greenend.org.uk/~sgtatham/putt…
    https://matt.ucc.asn.au/dropbear/CHANGES
    https://github.com/proftpd/proftpd/blob/master/RE…
    https://www.netsarang.com/en/xshell-update-history/
    https://www.paramiko.org/changelog.html
    https://www.openssh.com/openbsd.html
    https://github.com/openssh/openssh-portable/commi…
    https://groups.google.com/g/golang-announce/c/-n5…
    https://www.bitvise.com/ssh-server-version-history
    https://github.com/ronf/asyncssh/tags
    https://gitlab.com/libssh/libssh-mirror/-/tags
    https://www.reddit.com/r/sysadmin/comments/18idv5…
    https://github.com/erlang/otp/blob/d1b43dc0f1361d…
    https://www.openssh.com/txt/release-9.6
    https://jadaptive.com/important-java-ssh-security…
    https://www.terrapin-attack.com
    https://github.com/mkj/dropbear/blob/17657c36cce6…
    https://github.com/ronf/asyncssh/blob/develop/doc…
    https://thorntech.com/cve-2023-48795-and-sftp-gateway/
    https://github.com/warp-tech/russh/releases/tag/v0.40.2
    https://github.com/TeraTermProject/teraterm/commi…
    https://www.openwall.com/lists/oss-security/2023/…
    https://twitter.com/TrueSkrillor/status/173677438…
    https://github.com/golang/crypto/commit/9d2ee975e…
    https://github.com/paramiko/paramiko/issues/2337
    https://groups.google.com/g/golang-announce/c/qA3…
    https://news.ycombinator.com/item?id=38684904
    https://news.ycombinator.com/item?id=38685286
    http://www.openwall.com/lists/oss-security/2023/12/18/3 mailing-list
    https://github.com/mwiede/jsch/issues/457
    https://git.libssh.org/projects/libssh.git/commit…
    https://github.com/erlang/otp/releases/tag/OTP-26.2.1
    https://github.com/advisories/GHSA-45x7-px36-x8w8
    https://security-tracker.debian.org/tracker/sourc…
    https://security-tracker.debian.org/tracker/sourc…
    https://security-tracker.debian.org/tracker/CVE-2…
    https://bugzilla.suse.com/show_bug.cgi?id=1217950
    https://bugzilla.redhat.com/show_bug.cgi?id=2254210
    https://bugs.gentoo.org/920280
    https://ubuntu.com/security/CVE-2023-48795
    https://www.suse.com/c/suse-addresses-the-ssh-v2-…
    https://access.redhat.com/security/cve/cve-2023-48795
    https://github.com/mwiede/jsch/pull/461
    https://github.com/drakkan/sftpgo/releases/tag/v2.5.6
    https://github.com/libssh2/libssh2/pull/1291
    https://forum.netgate.com/topic/184941/terrapin-s…
    https://github.com/jtesta/ssh-audit/commit/8e972c…
    https://github.com/rapier1/hpn-ssh/releases
    https://github.com/proftpd/proftpd/issues/456
    https://github.com/TeraTermProject/teraterm/relea…
    https://github.com/mwiede/jsch/compare/jsch-0.2.1…
    https://oryx-embedded.com/download/#changelog
    https://www.crushftp.com/crush10wiki/Wiki.jsp?pag…
    https://github.com/connectbot/sshlib/compare/2.2.…
    https://github.com/connectbot/sshlib/commit/5c8b5…
    https://github.com/mscdex/ssh2/commit/97b223f8891…
    https://nest.pijul.com/pijul/thrussh/changes/D6H7…
    https://crates.io/crates/thrussh/versions
    https://github.com/NixOS/nixpkgs/pull/275249
    http://www.openwall.com/lists/oss-security/2023/12/19/5 mailing-list
    https://www.freebsd.org/security/advisories/FreeB…
    https://arstechnica.com/security/2023/12/hackers-…
    http://www.openwall.com/lists/oss-security/2023/12/20/3 mailing-list
    http://packetstormsecurity.com/files/176280/Terra…
    https://github.com/proftpd/proftpd/blob/d21e7a2e4…
    https://github.com/proftpd/proftpd/blob/0a7ea9b0b…
    https://github.com/apache/mina-sshd/issues/445
    https://github.com/hierynomus/sshj/issues/916
    https://github.com/janmojzis/tinyssh/issues/81
    https://www.openwall.com/lists/oss-security/2023/…
    https://security-tracker.debian.org/tracker/sourc…
    https://github.com/net-ssh/net-ssh/blob/2e65064a5…
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://www.debian.org/security/2023/dsa-5586 vendor-advisory
    https://www.lancom-systems.de/service-support/all…
    https://www.theregister.com/2023/12/20/terrapin_a…
    https://filezilla-project.org/versions.php
    https://nova.app/releases/#v11.8
    https://roumenpetrov.info/secsh/#news20231220
    https://www.vandyke.com/products/securecrt/history.txt
    https://help.panic.com/releasenotes/transmit5/
    https://github.com/PowerShell/Win32-OpenSSH/relea…
    https://github.com/PowerShell/Win32-OpenSSH/issues/2189
    https://winscp.net/eng/docs/history#6.2.2
    https://www.bitvise.com/ssh-client-version-history#933
    https://github.com/cyd01/KiTTY/issues/520
    https://www.debian.org/security/2023/dsa-5588 vendor-advisory
    https://github.com/ssh-mitm/ssh-mitm/issues/165
    https://news.ycombinator.com/item?id=38732005
    https://lists.debian.org/debian-lts-announce/2023… mailing-list
    https://security.gentoo.org/glsa/202312-16 vendor-advisory
    https://security.gentoo.org/glsa/202312-17 vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://security.netapp.com/advisory/ntap-2024010…
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://psirt.global.sonicwall.com/vuln-detail/SN…
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.debian.org/debian-lts-announce/2024… mailing-list
    https://lists.debian.org/debian-lts-announce/2024… mailing-list
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
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          "url": "https://www.paramiko.org/changelog.html"
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        {
          "url": "https://groups.google.com/g/golang-announce/c/-n5WqVC18LQ"
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        {
          "url": "https://github.com/ronf/asyncssh/tags"
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          "url": "https://jadaptive.com/important-java-ssh-security-update-new-ssh-vulnerability-discovered-cve-2023-48795/"
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          "url": "https://crates.io/crates/thrussh/versions"
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        {
          "name": "[oss-security] 20231219 Re: CVE-2023-48795: Prefix Truncation Attacks in SSH Specification (Terrapin Attack)",
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        {
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    CVE-2026-54697 (GCVE-0-2026-54697)

    Vulnerability from cvelistv5 – Published: 2026-10-13 15:54 – Updated: 2026-10-13 16:07
    VLAI
    Title
    ConnectBot SSH: Excessive allocation and integer overflow in DER private-key parsing
    Summary
    ConnectBot SSH Client Library is written in Kotlin with Kaitai Struct and KStateMachine. Prior to 0.3.1, DerReader.readLength() accepts excessive long-form DER length octets, accumulates them into an Int, and primitive readers allocate arrays without checking the declared size against the remaining input. An application or user that loads an attacker-provided private-key file through SshClient.authenticatePublicKey(), SshKeys.decodePemPrivateKey(), SshSigning.sign(), or SshSigning.getPublicKey() can trigger integer wraparound, excessive allocation, or an uncaught OutOfMemoryError. SSH server host keys and agent-forwarding messages do not use this application-supplied private-key input path. No usable weakened key and no confidentiality or integrity impact have been demonstrated. This issue is fixed in version 0.3.1.
    Severity
    6.7 (Medium)
    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-13 16:07 UTC
    CWE
    • CWE-190 - Integer Overflow or Wraparound
    • CWE-789 - Memory Allocation with Excessive Size Value
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7627 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    connectbot cbssh Affected: < 0.3.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-54700 (GCVE-0-2026-54700)

    Vulnerability from cvelistv5 – Published: 2026-10-13 15:53 – Updated: 2026-10-16 22:06
    VLAI
    Title
    ConnectBot SSH: Unbounded SSH field lengths can cause excessive memory allocation
    Summary
    ConnectBot SSH Client Library is written in Kotlin with Kaitai Struct and KStateMachine. Prior to 0.3.1, the SSH protocol parser trusts attacker-controlled inner byte lengths and element counts without verifying that they fit in the containing packet. A malicious or compromised SSH server can return a small malformed packet whose oversized declarations cause the Kaitai Struct Java runtime to attempt excessive allocation or repeated parsing before detecting truncated input. The general transport path requires a client connection but no authentication or optional feature; malformed SSH-agent messages additionally require SSH agent forwarding. The issue can raise an uncaught OutOfMemoryError and terminate the application process, with no demonstrated confidentiality or integrity impact. This issue is fixed in version 0.3.1.
    Severity
    6.9 (Medium)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-16 22:05 UTC
    CWE
    • CWE-20 - Improper Input Validation
    • CWE-789 - Memory Allocation with Excessive Size Value
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7627 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    connectbot cbssh Affected: < 0.3.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    "cveId": "CVE-2026-54700",
    "datePublished": "2026-10-13T15:53:47.361Z",
    "dateReserved": "2026-06-15T22:58:06.562Z",
    "dateUpdated": "2026-10-16T22:06:09.220Z",
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}

    CVE-2023-48795 (GCVE-0-2023-48795)

    Vulnerability from cvelistv5 – Published: 2023-12-18 00:00 – Updated: 2026-10-15 00:08
    VLAI
    Summary
    The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH's use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in chacha20-poly1305@openssh.com and (if CBC is used) the -etm@openssh.com MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80, AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.10.6, libssh2 through 1.11.0, Thorn Tech SFTP Gateway before 3.4.6, Tera Term before 5.1, Paramiko before 3.4.0, jsch before 0.2.15, SFTPGo before 2.5.6, Netgate pfSense Plus through 23.09.1, Netgate pfSense CE through 2.7.2, HPN-SSH through 18.2.0, ProFTPD before 1.3.8b (and before 1.3.9rc2), ORYX CycloneSSH before 2.3.4, NetSarang XShell 7 before Build 0144, CrushFTP before 10.6.0, ConnectBot SSH library before 2.2.22, Apache MINA sshd through 2.11.0, sshj through 0.37.0, TinySSH through 20230101, trilead-ssh2 6401, LANCOM LCOS and LANconfig, FileZilla before 3.66.4, Nova before 11.8, PKIX-SSH before 14.4, SecureCRT before 9.4.3, Transmit5 before 5.10.4, Win32-OpenSSH before 9.5.0.0p1-Beta, WinSCP before 6.2.2, Bitvise SSH Server before 9.32, Bitvise SSH Client before 9.33, KiTTY through 0.76.1.13, the net-ssh gem 7.2.0 for Ruby, the mscdex ssh2 module before 1.15.0 for Node.js, the thrussh library before 0.35.1 for Rust, and the Russh crate before 0.40.2 for Rust.
    Severity
    5.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2023-12-22 05:01 UTC
    CWE
    • n/a
    • CWE-354 - Improper Validation of Integrity Check Value
    Assigner
    mitre CNA under the mitre root
    CNA scorecard E 28/100 over 2348 records in the last 180 days details
    References
    URL Tags
    https://www.chiark.greenend.org.uk/~sgtatham/putt…
    https://matt.ucc.asn.au/dropbear/CHANGES
    https://github.com/proftpd/proftpd/blob/master/RE…
    https://www.netsarang.com/en/xshell-update-history/
    https://www.paramiko.org/changelog.html
    https://www.openssh.com/openbsd.html
    https://github.com/openssh/openssh-portable/commi…
    https://groups.google.com/g/golang-announce/c/-n5…
    https://www.bitvise.com/ssh-server-version-history
    https://github.com/ronf/asyncssh/tags
    https://gitlab.com/libssh/libssh-mirror/-/tags
    https://www.reddit.com/r/sysadmin/comments/18idv5…
    https://github.com/erlang/otp/blob/d1b43dc0f1361d…
    https://www.openssh.com/txt/release-9.6
    https://jadaptive.com/important-java-ssh-security…
    https://www.terrapin-attack.com
    https://github.com/mkj/dropbear/blob/17657c36cce6…
    https://github.com/ronf/asyncssh/blob/develop/doc…
    https://thorntech.com/cve-2023-48795-and-sftp-gateway/
    https://github.com/warp-tech/russh/releases/tag/v0.40.2
    https://github.com/TeraTermProject/teraterm/commi…
    https://www.openwall.com/lists/oss-security/2023/…
    https://twitter.com/TrueSkrillor/status/173677438…
    https://github.com/golang/crypto/commit/9d2ee975e…
    https://github.com/paramiko/paramiko/issues/2337
    https://groups.google.com/g/golang-announce/c/qA3…
    https://news.ycombinator.com/item?id=38684904
    https://news.ycombinator.com/item?id=38685286
    http://www.openwall.com/lists/oss-security/2023/12/18/3 mailing-list
    https://github.com/mwiede/jsch/issues/457
    https://git.libssh.org/projects/libssh.git/commit…
    https://github.com/erlang/otp/releases/tag/OTP-26.2.1
    https://github.com/advisories/GHSA-45x7-px36-x8w8
    https://security-tracker.debian.org/tracker/sourc…
    https://security-tracker.debian.org/tracker/sourc…
    https://security-tracker.debian.org/tracker/CVE-2…
    https://bugzilla.suse.com/show_bug.cgi?id=1217950
    https://bugzilla.redhat.com/show_bug.cgi?id=2254210
    https://bugs.gentoo.org/920280
    https://ubuntu.com/security/CVE-2023-48795
    https://www.suse.com/c/suse-addresses-the-ssh-v2-…
    https://access.redhat.com/security/cve/cve-2023-48795
    https://github.com/mwiede/jsch/pull/461
    https://github.com/drakkan/sftpgo/releases/tag/v2.5.6
    https://github.com/libssh2/libssh2/pull/1291
    https://forum.netgate.com/topic/184941/terrapin-s…
    https://github.com/jtesta/ssh-audit/commit/8e972c…
    https://github.com/rapier1/hpn-ssh/releases
    https://github.com/proftpd/proftpd/issues/456
    https://github.com/TeraTermProject/teraterm/relea…
    https://github.com/mwiede/jsch/compare/jsch-0.2.1…
    https://oryx-embedded.com/download/#changelog
    https://www.crushftp.com/crush10wiki/Wiki.jsp?pag…
    https://github.com/connectbot/sshlib/compare/2.2.…
    https://github.com/connectbot/sshlib/commit/5c8b5…
    https://github.com/mscdex/ssh2/commit/97b223f8891…
    https://nest.pijul.com/pijul/thrussh/changes/D6H7…
    https://crates.io/crates/thrussh/versions
    https://github.com/NixOS/nixpkgs/pull/275249
    http://www.openwall.com/lists/oss-security/2023/12/19/5 mailing-list
    https://www.freebsd.org/security/advisories/FreeB…
    https://arstechnica.com/security/2023/12/hackers-…
    http://www.openwall.com/lists/oss-security/2023/12/20/3 mailing-list
    http://packetstormsecurity.com/files/176280/Terra…
    https://github.com/proftpd/proftpd/blob/d21e7a2e4…
    https://github.com/proftpd/proftpd/blob/0a7ea9b0b…
    https://github.com/apache/mina-sshd/issues/445
    https://github.com/hierynomus/sshj/issues/916
    https://github.com/janmojzis/tinyssh/issues/81
    https://www.openwall.com/lists/oss-security/2023/…
    https://security-tracker.debian.org/tracker/sourc…
    https://github.com/net-ssh/net-ssh/blob/2e65064a5…
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://www.debian.org/security/2023/dsa-5586 vendor-advisory
    https://www.lancom-systems.de/service-support/all…
    https://www.theregister.com/2023/12/20/terrapin_a…
    https://filezilla-project.org/versions.php
    https://nova.app/releases/#v11.8
    https://roumenpetrov.info/secsh/#news20231220
    https://www.vandyke.com/products/securecrt/history.txt
    https://help.panic.com/releasenotes/transmit5/
    https://github.com/PowerShell/Win32-OpenSSH/relea…
    https://github.com/PowerShell/Win32-OpenSSH/issues/2189
    https://winscp.net/eng/docs/history#6.2.2
    https://www.bitvise.com/ssh-client-version-history#933
    https://github.com/cyd01/KiTTY/issues/520
    https://www.debian.org/security/2023/dsa-5588 vendor-advisory
    https://github.com/ssh-mitm/ssh-mitm/issues/165
    https://news.ycombinator.com/item?id=38732005
    https://lists.debian.org/debian-lts-announce/2023… mailing-list
    https://security.gentoo.org/glsa/202312-16 vendor-advisory
    https://security.gentoo.org/glsa/202312-17 vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://security.netapp.com/advisory/ntap-2024010…
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://psirt.global.sonicwall.com/vuln-detail/SN…
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.debian.org/debian-lts-announce/2024… mailing-list
    https://lists.debian.org/debian-lts-announce/2024… mailing-list
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
    https://support.apple.com/kb/HT214084
    http://seclists.org/fulldisclosure/2024/Mar/21 mailing-list
    https://lists.debian.org/debian-lts-announce/2024… mailing-list
    http://www.openwall.com/lists/oss-security/2024/04/17/8 mailing-list
    http://www.openwall.com/lists/oss-security/2024/03/06/3 mailing-list
    https://www.vicarius.io/vsociety/posts/cve-2023-4…
    https://www.vicarius.io/vsociety/posts/cve-2023-4…
    https://lists.debian.org/debian-lts-announce/2025…
    https://lists.debian.org/debian-lts-announce/2024…
    https://lists.debian.org/debian-lts-announce/2024…
    https://lists.fedoraproject.org/archives/list/pac…
    https://lists.fedoraproject.org/archives/list/pac…
    https://lists.fedoraproject.org/archives/list/pac…
    https://lists.fedoraproject.org/archives/list/pac…
    https://lists.fedoraproject.org/archives/list/pac…
    https://lists.fedoraproject.org/archives/list/pac…
    https://lists.fedoraproject.org/archives/list/pac…
    https://lists.fedoraproject.org/archives/list/pac…
    https://lists.fedoraproject.org/archives/list/pac…
    https://lists.fedoraproject.org/archives/list/pac…
    https://lists.fedoraproject.org/archives/list/pac…
    https://cert-portal.siemens.com/productcert/html/…
    https://cert-portal.siemens.com/productcert/html/…
    https://cert-portal.siemens.com/productcert/html/…
    https://cert-portal.siemens.com/productcert/html/…
    https://cert-portal.siemens.com/productcert/html/…
    Impacted products
    Show details on NVD website
    To clipboard 

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          "value": "The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH\u0027s use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in chacha20-poly1305@openssh.com and (if CBC is used) the -etm@openssh.com MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80, AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.10.6, libssh2 through 1.11.0, Thorn Tech SFTP Gateway before 3.4.6, Tera Term before 5.1, Paramiko before 3.4.0, jsch before 0.2.15, SFTPGo before 2.5.6, Netgate pfSense Plus through 23.09.1, Netgate pfSense CE through 2.7.2, HPN-SSH through 18.2.0, ProFTPD before 1.3.8b (and before 1.3.9rc2), ORYX CycloneSSH before 2.3.4, NetSarang XShell 7 before Build 0144, CrushFTP before 10.6.0, ConnectBot SSH library before 2.2.22, Apache MINA sshd through 2.11.0, sshj through 0.37.0, TinySSH through 20230101, trilead-ssh2 6401, LANCOM LCOS and LANconfig, FileZilla before 3.66.4, Nova before 11.8, PKIX-SSH before 14.4, SecureCRT before 9.4.3, Transmit5 before 5.10.4, Win32-OpenSSH before 9.5.0.0p1-Beta, WinSCP before 6.2.2, Bitvise SSH Server before 9.32, Bitvise SSH Client before 9.33, KiTTY through 0.76.1.13, the net-ssh gem 7.2.0 for Ruby, the mscdex ssh2 module before 1.15.0 for Node.js, the thrussh library before 0.35.1 for Rust, and the Russh crate before 0.40.2 for Rust."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-05-01T18:06:23.972Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html"
        },
        {
          "url": "https://matt.ucc.asn.au/dropbear/CHANGES"
        },
        {
          "url": "https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES"
        },
        {
          "url": "https://www.netsarang.com/en/xshell-update-history/"
        },
        {
          "url": "https://www.paramiko.org/changelog.html"
        },
        {
          "url": "https://www.openssh.com/openbsd.html"
        },
        {
          "url": "https://github.com/openssh/openssh-portable/commits/master"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/-n5WqVC18LQ"
        },
        {
          "url": "https://www.bitvise.com/ssh-server-version-history"
        },
        {
          "url": "https://github.com/ronf/asyncssh/tags"
        },
        {
          "url": "https://gitlab.com/libssh/libssh-mirror/-/tags"
        },
        {
          "url": "https://www.reddit.com/r/sysadmin/comments/18idv52/cve202348795_why_is_this_cve_still_undisclosed/"
        },
        {
          "url": "https://github.com/erlang/otp/blob/d1b43dc0f1361d2ad67601169e90a7fc50bb0369/lib/ssh/doc/src/notes.xml#L39-L42"
        },
        {
          "url": "https://www.openssh.com/txt/release-9.6"
        },
        {
          "url": "https://jadaptive.com/important-java-ssh-security-update-new-ssh-vulnerability-discovered-cve-2023-48795/"
        },
        {
          "url": "https://www.terrapin-attack.com"
        },
        {
          "url": "https://github.com/mkj/dropbear/blob/17657c36cce6df7716d5ff151ec09a665382d5dd/CHANGES#L25"
        },
        {
          "url": "https://github.com/ronf/asyncssh/blob/develop/docs/changes.rst"
        },
        {
          "url": "https://thorntech.com/cve-2023-48795-and-sftp-gateway/"
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        {
          "url": "https://github.com/warp-tech/russh/releases/tag/v0.40.2"
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        {
          "url": "https://www.openwall.com/lists/oss-security/2023/12/18/2"
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          "url": "https://github.com/golang/crypto/commit/9d2ee975ef9fe627bf0a6f01c1f69e8ef1d4f05d"
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          "url": "https://github.com/paramiko/paramiko/issues/2337"
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        {
          "url": "https://groups.google.com/g/golang-announce/c/qA3XtxvMUyg"
        },
        {
          "url": "https://news.ycombinator.com/item?id=38684904"
        },
        {
          "url": "https://news.ycombinator.com/item?id=38685286"
        },
        {
          "name": "[oss-security] 20231218 CVE-2023-48795: Prefix Truncation Attacks in SSH Specification (Terrapin Attack)",
          "tags": [
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          "url": "http://www.openwall.com/lists/oss-security/2023/12/18/3"
        },
        {
          "url": "https://github.com/mwiede/jsch/issues/457"
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        {
          "url": "https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.10\u0026id=10e09e273f69e149389b3e0e5d44b8c221c2e7f6"
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        {
          "url": "https://github.com/erlang/otp/releases/tag/OTP-26.2.1"
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          "url": "https://github.com/advisories/GHSA-45x7-px36-x8w8"
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        {
          "url": "https://security-tracker.debian.org/tracker/source-package/libssh2"
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        {
          "url": "https://security-tracker.debian.org/tracker/source-package/proftpd-dfsg"
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          "url": "https://www.suse.com/c/suse-addresses-the-ssh-v2-protocol-terrapin-attack-aka-cve-2023-48795/"
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        {
          "url": "https://access.redhat.com/security/cve/cve-2023-48795"
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          "url": "https://github.com/mwiede/jsch/pull/461"
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        {
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        {
          "url": "https://forum.netgate.com/topic/184941/terrapin-ssh-attack"
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        {
          "url": "https://github.com/jtesta/ssh-audit/commit/8e972c5e94b460379fe0c7d20209c16df81538a5"
        },
        {
          "url": "https://github.com/rapier1/hpn-ssh/releases"
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        {
          "url": "https://github.com/proftpd/proftpd/issues/456"
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        {
          "url": "https://github.com/TeraTermProject/teraterm/releases/tag/v5.1"
        },
        {
          "url": "https://github.com/mwiede/jsch/compare/jsch-0.2.14...jsch-0.2.15"
        },
        {
          "url": "https://oryx-embedded.com/download/#changelog"
        },
        {
          "url": "https://www.crushftp.com/crush10wiki/Wiki.jsp?page=Update"
        },
        {
          "url": "https://github.com/connectbot/sshlib/compare/2.2.21...2.2.22"
        },
        {
          "url": "https://github.com/connectbot/sshlib/commit/5c8b534f6e97db7ac0e0e579331213aa25c173ab"
        },
        {
          "url": "https://github.com/mscdex/ssh2/commit/97b223f8891b96d6fc054df5ab1d5a1a545da2a3"
        },
        {
          "url": "https://nest.pijul.com/pijul/thrussh/changes/D6H7OWTTMHHX6BTB3B6MNBOBX2L66CBL4LGSEUSAI2MCRCJDQFRQC"
        },
        {
          "url": "https://crates.io/crates/thrussh/versions"
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        {
          "url": "https://github.com/NixOS/nixpkgs/pull/275249"
        },
        {
          "name": "[oss-security] 20231219 Re: CVE-2023-48795: Prefix Truncation Attacks in SSH Specification (Terrapin Attack)",
          "tags": [
            "mailing-list"
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          "url": "http://www.openwall.com/lists/oss-security/2023/12/19/5"
        },
        {
          "url": "https://www.freebsd.org/security/advisories/FreeBSD-SA-23:19.openssh.asc"
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        {
          "url": "https://arstechnica.com/security/2023/12/hackers-can-break-ssh-channel-integrity-using-novel-data-corruption-attack/"
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        {
          "name": "[oss-security] 20231220 Re: CVE-2023-48795: Prefix Truncation Attacks in SSH Specification (Terrapin Attack)",
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          "url": "http://www.openwall.com/lists/oss-security/2023/12/20/3"
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          "url": "http://packetstormsecurity.com/files/176280/Terrapin-SSH-Connection-Weakening.html"
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          "url": "https://www.debian.org/security/2023/dsa-5586"
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          "url": "https://nova.app/releases/#v11.8"
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          "url": "https://roumenpetrov.info/secsh/#news20231220"
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        {
          "url": "https://help.panic.com/releasenotes/transmit5/"
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          "url": "https://winscp.net/eng/docs/history#6.2.2"
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  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2023-48795",
    "datePublished": "2023-12-18T00:00:00.000Z",
    "dateReserved": "2023-11-20T00:00:00.000Z",
    "dateUpdated": "2026-10-15T00:08:53.704Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}