Common Weakness Enumeration
CWE-757
AllowedSelection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Abstraction: Base · Status: Incomplete
A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm should be used as a protection mechanism such as encryption or authentication, but it does not select the strongest algorithm that is available to both parties.
48 vulnerabilities reference this CWE, most recent first.
CVE-2026-54780 (GCVE-0-2026-54780)
Vulnerability from cvelistv5 – Published: 2026-07-08 22:15 – Updated: 2026-07-09 19:21
VLAI
EPSS
VEX
Title
CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass
Summary
CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, the CoreWCF WS-Security 1.0 receive pipeline validates ds:SignedInfo SignatureMethod against the configured SecurityAlgorithmSuite but does not validate each ds:Reference DigestMethod, allowing a sender to use a rejected digest algorithm such as SHA-1 while the message is still accepted. This issue is fixed in versions 1.8.1 and 1.9.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/CoreWCF/CoreWCF/security/advis… | x_refsource_CONFIRM |
| https://github.com/CoreWCF/CoreWCF/commit/5874231… | x_refsource_MISC |
| https://github.com/CoreWCF/CoreWCF/commit/9104e58… | x_refsource_MISC |
| https://github.com/CoreWCF/CoreWCF/commit/fea67b2… | x_refsource_MISC |
| https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 | x_refsource_MISC |
| https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1 | x_refsource_MISC |
Impacted products
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CVE-2026-54291 (GCVE-0-2026-54291)
Vulnerability from cvelistv5 – Published: 2026-07-06 18:55 – Updated: 2026-07-06 19:47
VLAI
EPSS
VEX
Title
Silent channel-binding authentication downgrade via unsupported certificate algorithms
Summary
pgjdbc is an open source postgresql JDBC Driver. In releases 42.7.4 through 42.7.11, channelBinding=require connections can be silently downgraded from SCRAM-SHA-256-PLUS with channel binding to plain SCRAM-SHA-256 without it, losing the man-in-the-middle protection the setting is meant to guarantee. An attacker who can intercept the TLS connection can trigger the downgrade with a certificate whose signature algorithm has no tls-server-end-point channel-binding hash, because the bundled com.ongres.scram:scram-client returns an empty byte array instead of failing and pgJDBC ScramAuthenticator checks only that the server advertised a PLUS mechanism, without rejecting the empty binding or checking that the negotiated mechanism uses channel binding. This issue is fixed in version 42.7.12.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/pgjdbc/pgjdbc/security/advisor… | x_refsource_CONFIRM |
| https://github.com/pgjdbc/pgjdbc/commit/77df98e4e… | x_refsource_MISC |
| https://github.com/ongres/scram/releases/tag/3.3 | x_refsource_MISC |
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CVE-2026-48747 (GCVE-0-2026-48747)
Vulnerability from cvelistv5 – Published: 2026-07-14 19:16 – Updated: 2026-07-14 19:16
VLAI
EPSS
VEX
Title
Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade
Summary
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.13 and 8.0.13, MailomatRequestParser::validateSignature() parsed X-MOM-Webhook-Signature as algo=signature and passed the request-selected algorithm to hash_hmac(), allowing a signature algorithm downgrade instead of enforcing Mailomat's documented SHA-256 webhook signature. This issue is fixed in versions 7.4.13 and 8.0.13.
Severity
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/symfony/symfony/security/advis… | x_refsource_CONFIRM |
| https://github.com/symfony/symfony/commit/bdfe9fe… | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v7.4.13 | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v8.0.13 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| symfony | symfony |
Affected:
>= 7.2.0, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.13 |
|
| symfony | mailomat-mailer |
Affected:
>= 7.2.0, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.13 |
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CVE-2026-32650 (GCVE-0-2026-32650)
Vulnerability from cvelistv5 – Published: 2026-04-17 19:52 – Updated: 2026-04-17 20:26
VLAI
EPSS
VEX
Title
Anviz CrossChex Standard Algorithm Downgrade
Summary
Anviz CrossChex Standard is vulnerable when an attacker manipulates the TDS7 PreLogin to disable
encryption, causing database credentials to be sent in plaintext and
enabling unauthorized database access.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Anviz | Anviz CrossChex Standard |
Affected:
All versions
|
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CVE-2026-6550 (GCVE-0-2026-6550)
Vulnerability from cvelistv5 – Published: 2026-04-20 19:20 – Updated: 2026-04-20 19:44
VLAI
EPSS
VEX
Title
Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python
Summary
Cryptographic algorithm downgrade in the caching layer of Amazon AWS Encryption SDK for Python before version 3.3.1 and before version 4.0.5 might allow an authenticated local threat actor to bypass key commitment policy enforcement via a shared key cache, resulting in ciphertext that can be decrypted to multiple different plaintexts.
To remediate this issue, users should upgrade to version 3.3.1, 4.0.5 or above.
Severity
4.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-757 - Selection of Less-Secure algorithm during negotiation ('algorithm downgrade')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://aws.amazon.com/security/security-bulletin… | vendor-advisory |
| https://github.com/aws/aws-encryption-sdk-python/… | patch |
| https://github.com/aws/aws-encryption-sdk-python/… | patch |
| https://github.com/aws/aws-encryption-sdk-python/… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| AWS | AWS Encryption SDK for Python |
Affected:
2 , ≤ 2.5.1
(custom)
Affected: 3 , ≤ 3.3.0 (custom) Affected: 4 , ≤ 4.0.4 (custom) |
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CVE-2026-6092 (GCVE-0-2026-6092)
Vulnerability from cvelistv5 – Published: 2026-06-25 21:06 – Updated: 2026-06-26 10:25
VLAI
EPSS
VEX
Title
Encrypt-then-MAC could fall back to MAC-then-Encrypt when HAVE_ENCRYPT_THEN_MAC is configured
Summary
When HAVE_ENCRYPT_THEN_MAC is configured, the implementation could fall back to MAC-then-Encrypt rather than enforcing Encrypt-then-MAC.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
2 references
Impacted products
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CVE-2026-2673 (GCVE-0-2026-2673)
Vulnerability from cvelistv5 – Published: 2026-03-13 13:23 – Updated: 2026-05-18 19:23
VLAI
EPSS
VEX
Title
OpenSSL TLS 1.3 server may choose unexpected key agreement group
Summary
Issue summary: An OpenSSL TLS 1.3 server may fail to negotiate the expected
preferred key exchange group when its key exchange group configuration includes
the default by using the 'DEFAULT' keyword.
Impact summary: A less preferred key exchange may be used even when a more
preferred group is supported by both client and server, if the group
was not included among the client's initial predicated keyshares.
This will sometimes be the case with the new hybrid post-quantum groups,
if the client chooses to defer their use until specifically requested by
the server.
If an OpenSSL TLS 1.3 server's configuration uses the 'DEFAULT' keyword to
interpolate the built-in default group list into its own configuration, perhaps
adding or removing specific elements, then an implementation defect causes the
'DEFAULT' list to lose its 'tuple' structure, and all server-supported groups
were treated as a single sufficiently secure 'tuple', with the server not
sending a Hello Retry Request (HRR) even when a group in a more preferred tuple
was mutually supported.
As a result, the client and server might fail to negotiate a mutually supported
post-quantum key agreement group, such as 'X25519MLKEM768', if the client's
configuration results in only 'classical' groups (such as 'X25519' being the
only ones in the client's initial keyshare prediction).
OpenSSL 3.5 and later support a new syntax for selecting the most preferred TLS
1.3 key agreement group on TLS servers. The old syntax had a single 'flat'
list of groups, and treated all the supported groups as sufficiently secure.
If any of the keyshares predicted by the client were supported by the server
the most preferred among these was selected, even if other groups supported by
the client, but not included in the list of predicted keyshares would have been
more preferred, if included.
The new syntax partitions the groups into distinct 'tuples' of roughly
equivalent security. Within each tuple the most preferred group included among
the client's predicted keyshares is chosen, but if the client supports a group
from a more preferred tuple, but did not predict any corresponding keyshares,
the server will ask the client to retry the ClientHello (by issuing a Hello
Retry Request or HRR) with the most preferred mutually supported group.
The above works as expected when the server's configuration uses the built-in
default group list, or explicitly defines its own list by directly defining the
various desired groups and group 'tuples'.
No OpenSSL FIPS modules are affected by this issue, the code in question lies
outside the FIPS boundary.
OpenSSL 3.6 and 3.5 are vulnerable to this issue.
OpenSSL 3.6 users should upgrade to OpenSSL 3.6.2 once it is released.
OpenSSL 3.5 users should upgrade to OpenSSL 3.5.6 once it is released.
OpenSSL 3.4, 3.3, 3.0, 1.0.2 and 1.1.1 are not affected by this issue.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
5 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| OpenSSL | OpenSSL |
Affected:
3.6.0 , < 3.6.2
(semver)
Affected: 3.5.0 , < 3.5.6 (semver) |
|
| Siemens | SIMATIC CN 4100 |
Affected:
0 , < V5.0
(custom)
|
Date Public
2026-03-13 14:00
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CVE-2026-1677 (GCVE-0-2026-1677)
Vulnerability from cvelistv5 – Published: 2026-05-11 05:52 – Updated: 2026-05-11 16:31
VLAI
EPSS
VEX
Title
net: TLS 1.2 connections allowed on TLS 1.3 sockets
Summary
Zephyr sockets created with `IPPROTO_TLS_1_3` can still negotiate a TLS 1.2 connection when both TLS versions are enabled in Kconfig, because the socket-level protocol selection is not propagated to mbedTLS (e.g. via `mbedtls_ssl_conf_min_tls_version`). The ClientHello advertises both versions and the peer can establish TLS 1.2, so applications that assumed `IPPROTO_TLS_1_3` enforces TLS 1.3 may silently use TLS 1.2 and remain exposed to TLS 1.2-specific weaknesses. As a workaround, the `TLS_CIPHERSUITE_LIST` socket option can be restricted to TLS 1.3-only cipher suites.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| zephyrproject-rtos | Zephyr |
Affected:
* , ≤ 4.3
(git)
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CVE-2025-59270 (GCVE-0-2025-59270)
Vulnerability from cvelistv5 – Published: 2025-09-16 14:41 – Updated: 2025-09-30 14:52
VLAI
EPSS
VEX
Title
psPAS does not enforce TLS 1.2 within Get-PASSAMLResponse
Summary
psPAS PowerShell module does not explicitly enforce TLS 1.2 within the 'Get-PASSAMLResponse' function during the SAML authentication process. An unauthenticated attacker in a 'Man-in-the-Middle' position could manipulate the TLS handshake and downgrade TLS to a deprecated protocol. Fixed in 7.0.209.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
Impacted products
Date Public
2025-09-09 00:00
Credits
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CVE-2025-36582 (GCVE-0-2025-36582)
Vulnerability from cvelistv5 – Published: 2025-07-01 13:12 – Updated: 2025-07-01 13:32
VLAI
EPSS
VEX
Summary
Dell NetWorker, versions 19.12.0.1 and prior, contains a Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade') vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to Information disclosure.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.dell.com/support/kbdoc/en-us/00033875… | vendor-advisory |
Date Public
2025-07-01 05:00
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No mitigation information available for this CWE.
CAPEC-220: Client-Server Protocol Manipulation
An adversary takes advantage of weaknesses in the protocol by which a client and server are communicating to perform unexpected actions. Communication protocols are necessary to transfer messages between client and server applications. Moreover, different protocols may be used for different types of interactions.
CAPEC-606: Weakening of Cellular Encryption
An attacker, with control of a Cellular Rogue Base Station or through cooperation with a Malicious Mobile Network Operator can force the mobile device (e.g., the retransmission device) to use no encryption (A5/0 mode) or to use easily breakable encryption (A5/1 or A5/2 mode).
CAPEC-620: Drop Encryption Level
An attacker forces the encryption level to be lowered, thus enabling a successful attack against the encrypted data.