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CVE-2011-4096
The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of…
Medium5.0EPSS 37.2%
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record.
Timeline
ID reserved
By redhat
- 30 days later
· 30 days later
Published
- 13 years later
· 13 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
- EPSS (exploitation in 30 days)
- 37.2% · top 1.5% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.
Weakness
Affected products
n/a
- affected n/a
References (11)
- http://bugs.squid-cache.org/show_bug.cgi?id=3237#c12 (opens in a new tab)x_refsource_MISCx_transferred
- RHSA-2011:1791 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- SUSE-SU-2016:1996 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- [oss-security] 20111031 CVE Request -- Squid v3.1.16 -- Invalid free by processing CNAME DNS record pointing to another CNAME record pointing to an empty A-record (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 1026265 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- [oss-security] 20111031 Re: CVE Request -- Squid v3.1.16 -- Invalid free by processing CNAME DNS record pointing to another CNAME record pointing to an empty A-record (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- MDVSA-2011:193 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
- 46609 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- http://www.squid-cache.org/Versions/v3/3.1/changesets/SQUID_3_1_16.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- SUSE-SU-2016:2089 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- 47459 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2011-4096)Record last updated .