CVE-2011-4096: n/a vulnerability

CVE-2011-4096: The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attack...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 23:53 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2011-4096 is an availability bug in Squid. A specially formed DNS response can trigger incorrect memory handling and abort the Squid daemon, interrupting proxy service. The provided sources identify Squid before 3.1.16 and vendor-packaged Squid updates as the relevant remediation path. Exposure is most likely where legacy Squid 3.1.x or older vendor packages remain deployed as forward proxies, caching proxies, or embedded network appliances. Internet-facing or broadly reachable proxies carry higher operational impact because the documented result is service interruption. Treat this as a service reliability issue. It is not presented as data compromise, but an exposed or business-critical proxy crash can disrupt user access and security controls. Remediate during normal patch cycles unless the proxy is high dependency or externally reachable. Mitigation focus: Upgrade Squid to 3.1.16 or a vendor-supported fixed package.; Review Red Hat, SUSE, Mandriva, or applicable vendor advisories for package status.; Prioritize proxies supporting critical browsing, egress control, or application traffic..

Prepared: Jun 27, 2026, 17:48 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 17, 2011, 19:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

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