squid: child assertion failure when processing large DNS replies with no IPv6 resolver present
Published Oct 12, 2010
5.0
MEDIUMCVSS 2.0
EPSS 31.46%
Description
dns_internal.cc in Squid 3.1.6, when IPv6 DNS resolution is not enabled, accesses an invalid socket during an IPv4 TCP DNS query, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via vectors that trigger an IPv4 DNS response with the TC bit set.
Affected products
No data.
- 3.1.6
No data.
Red Hat Enterprise Linux 4
squid
Not affected
Red Hat Enterprise Linux 5
squid
Not affected
Red Hat Enterprise Linux 6
squid
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | squid | Not affected | n/a |
| Red Hat Enterprise Linux 5 | squid | Not affected | n/a |
| Red Hat Enterprise Linux 6 | squid | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (18 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 31.46% (0.31465) | 98.23th | v5 (v2026.06.15) |
| Jun 15, 2026 | 31.46% (0.31465) | 98.05th | v5 (v2026.06.15) |
| Dec 28, 2025 | 55.18% (0.55183) | 97.95th | v4 (v2025.03.14) |
| Dec 27, 2025 | 51.59% (0.51588) | 97.80th | v4 (v2025.03.14) |
| Oct 28, 2025 | 55.18% (0.55183) | 97.93th | v4 (v2025.03.14) |
| Oct 27, 2025 | 51.59% (0.51588) | 97.76th | v4 (v2025.03.14) |
| Oct 1, 2025 | 55.18% (0.55183) | 98.00th | v4 (v2025.03.14) |
| Aug 20, 2025 | 51.59% (0.51588) | 97.80th | v4 (v2025.03.14) |
| Jul 30, 2025 | 45.62% (0.45622) | 97.50th | v4 (v2025.03.14) |
| Mar 30, 2025 | 52.56% (0.52558) | 97.71th | v4 (v2025.03.14) |
| Mar 29, 2025 | 55.15% (0.55153) | 97.18th | v4 (v2025.03.14) |
| Mar 19, 2025 | 52.56% (0.52558) | 97.63th | v4 (v2025.03.14) |
| Mar 17, 2025 | 49.55% (0.49546) | 97.52th | v4 (v2025.03.14) |
| Dec 12, 2024 | 34.23% (0.34231) | 97.24th | v3 (v2023.03.01) |
| Mar 7, 2023 | 34.23% (0.34231) | 96.37th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
No CWE recorded.
References (14)
- http://bazaar.launchpad.net/~squid/squid/3.1/revision/10072 x_refsource_CONFIRMPatch
- http://bugs.gentoo.org/show_bug.cgi?id=334263 x_refsource_CONFIRM
- http://bugs.squid-cache.org/show_bug.cgi?id=3009 x_refsource_CONFIRM
- http://bugs.squid-cache.org/show_bug.cgi?id=3021 x_refsource_CONFIRM
- http://marc.info/?l=squid-users&m=128263555724981&w=2 mailing-listx_refsource_MLISTPatchVendor Advisory
- http://www.openwall.com/lists/oss-security/2010/08/24/6 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2010/08/24/7 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2010/08/25/2 mailing-listx_refsource_MLISTPatch
- http://www.openwall.com/lists/oss-security/2010/08/25/6 mailing-listx_refsource_MLIST
- http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10072.patch x_refsource_CONFIRMPatch
- https://access.redhat.com/security/cve/CVE-2010-2951 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=626927 x_refsource_CONFIRMIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2010-2951
- https://www.cve.org/CVERecord?id=CVE-2010-2951
Change history (0)
No recorded changes yet.