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Vulnerability from cleanstart
Published
2026-09-04 00:59
Modified
2026-09-03 10:27
Summary
dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-...
Details
Multiple security vulnerabilities affect the dnsmasq package. dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS. See references for individual vulnerability details.
Severity
9.8 (Critical)
References
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CVE-2020-25682 (GCVE-0-2020-25682)
Vulnerability from cvelistv5 – Published: 2021-01-20 16:28 – Updated: 2025-11-04 19:12
VLAI
EPSS
VEX
Summary
A flaw was found in dnsmasq before 2.83. A buffer overflow vulnerability was discovered in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap-allocated memory, possibly executing code on the machine. The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. However, in some code execution paths, it is possible extract_name() gets passed an offset from the base buffer, thus reducing, in practice, the number of available bytes that can be written in the buffer. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Severity
No CVSS data available.
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://www.jsof-tech.com/disclosures/dnspooq/ | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=1882014 | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://security.gentoo.org/glsa/202101-17 | vendor-advisoryx_refsource_GENTOO |
| https://www.debian.org/security/2021/dsa-4844 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://www.kb.cert.org/vuls/id/434904 |
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CVE-2020-25683 (GCVE-0-2020-25683)
Vulnerability from cvelistv5 – Published: 2021-01-20 15:25 – Updated: 2025-11-04 19:12
VLAI
EPSS
VEX
Summary
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. A remote attacker, who can create valid DNS replies, could use this flaw to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Severity
No CVSS data available.
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://www.jsof-tech.com/disclosures/dnspooq/ | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=1882018 | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://security.gentoo.org/glsa/202101-17 | vendor-advisoryx_refsource_GENTOO |
| https://www.debian.org/security/2021/dsa-4844 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://www.kb.cert.org/vuls/id/434904 |
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CVE-2020-25684 (GCVE-0-2020-25684)
Vulnerability from cvelistv5 – Published: 2021-01-20 15:22 – Updated: 2025-11-04 19:12
VLAI
EPSS
VEX
Summary
A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.
Severity
No CVSS data available.
CWE
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1889686 | x_refsource_MISC |
| https://www.jsof-tech.com/disclosures/dnspooq/ | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://security.gentoo.org/glsa/202101-17 | vendor-advisoryx_refsource_GENTOO |
| https://www.debian.org/security/2021/dsa-4844 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://www.arista.com/en/support/advisories-noti… | x_refsource_MISC |
| https://www.kb.cert.org/vuls/id/434904 |
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CVE-2020-25685 (GCVE-0-2020-25685)
Vulnerability from cvelistv5 – Published: 2021-01-20 00:00 – Updated: 2025-11-04 19:12
VLAI
EPSS
VEX
Summary
A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.
Severity
No CVSS data available.
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://www.jsof-tech.com/disclosures/dnspooq/ | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1889688 | |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://security.gentoo.org/glsa/202101-17 | vendor-advisory |
| https://www.debian.org/security/2021/dsa-4844 | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://www.arista.com/en/support/advisories-noti… | |
| https://www.kb.cert.org/vuls/id/434904 |
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CVE-2020-25686 (GCVE-0-2020-25686)
Vulnerability from cvelistv5 – Published: 2021-01-20 16:47 – Updated: 2025-11-04 19:12
VLAI
EPSS
VEX
Summary
A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.
Severity
No CVSS data available.
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://www.jsof-tech.com/disclosures/dnspooq/ | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=1890125 | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://security.gentoo.org/glsa/202101-17 | vendor-advisoryx_refsource_GENTOO |
| https://www.debian.org/security/2021/dsa-4844 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.arista.com/en/support/advisories-noti… | x_refsource_MISC |
| https://www.kb.cert.org/vuls/id/434904 |
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CVE-2020-25687 (GCVE-0-2020-25687)
Vulnerability from cvelistv5 – Published: 2021-01-20 16:31 – Updated: 2025-11-04 19:12
VLAI
EPSS
VEX
Summary
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Severity
No CVSS data available.
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://www.jsof-tech.com/disclosures/dnspooq/ | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=1891568 | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://security.gentoo.org/glsa/202101-17 | vendor-advisoryx_refsource_GENTOO |
| https://www.debian.org/security/2021/dsa-4844 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://www.kb.cert.org/vuls/id/434904 |
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CVE-2021-3448 (GCVE-0-2021-3448)
Vulnerability from cvelistv5 – Published: 2021-04-08 22:06 – Updated: 2025-12-03 00:40
VLAI
EPSS
VEX
Summary
A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. The highest threat from this vulnerability is to data integrity.
Severity
4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-03 00:40 UTC
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1939368 | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
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CVE-2022-0934 (GCVE-0-2022-0934)
Vulnerability from cvelistv5 – Published: 2022-08-29 14:03 – Updated: 2025-11-03 21:45
VLAI
EPSS
VEX
Summary
A single-byte, non-arbitrary write/use-after-free flaw was found in dnsmasq. This flaw allows an attacker who sends a crafted packet processed by dnsmasq, potentially causing a denial of service.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-10 13:19 UTC
CWE
- CWE-416 - - Use After Free
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=2057075 | x_refsource_MISC |
| https://lists.thekelleys.org.uk/pipermail/dnsmasq… | x_refsource_MISC |
| https://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3… | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2022-0934 | x_refsource_MISC |
| https://lists.debian.org/debian-lts-announce/2024… |
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CVE-2023-28450 (GCVE-0-2023-28450)
Vulnerability from cvelistv5 – Published: 2023-03-15 00:00 – Updated: 2025-11-03 21:47
VLAI
EPSS
VEX
Summary
An issue was discovered in Dnsmasq before 2.90. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-26 21:21 UTC
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://thekelleys.org.uk/dnsmasq/doc.html | |
| https://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3… | |
| https://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3… | |
| https://capec.mitre.org/data/definitions/495.html | |
| 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… |
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CVE-2023-50387 (GCVE-0-2023-50387)
Vulnerability from cvelistv5 – Published: 2024-02-14 00:00 – Updated: 2025-11-04 18:20
VLAI
EPSS
VEX
Summary
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-08 17:27 UTC
CWE
- n/a
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
36 references
| URL | Tags |
|---|---|
| https://www.athene-center.de/aktuelles/key-trap | |
| https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.1… | |
| https://kb.isc.org/docs/cve-2023-50387 | |
| https://docs.powerdns.com/recursor/security-advis… | |
| https://www.theregister.com/2024/02/13/dnssec_vul… | |
| https://news.ycombinator.com/item?id=39367411 | |
| https://www.securityweek.com/keytrap-dns-attack-c… | |
| https://www.isc.org/blogs/2024-bind-security-release/ | |
| https://news.ycombinator.com/item?id=39372384 | |
| https://gitlab.nic.cz/knot/knot-resolver/-/releas… | |
| https://lists.thekelleys.org.uk/pipermail/dnsmasq… | |
| https://msrc.microsoft.com/update-guide/vulnerabi… | |
| https://access.redhat.com/security/cve/CVE-2023-50387 | |
| https://bugzilla.suse.com/show_bug.cgi?id=1219823 | |
| https://www.athene-center.de/fileadmin/content/PD… | |
| http://www.openwall.com/lists/oss-security/2024/02/16/2 | mailing-list |
| http://www.openwall.com/lists/oss-security/2024/02/16/3 | mailing-list |
| 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.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.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2024030… | |
| https://lists.debian.org/debian-lts-announce/2024… | mailing-list |
| 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… |
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}
Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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