CVE-2016-4556

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Double Free</a>", "id": "CVE-2016-4556", "lastModified": "2026-06-17T00:47:46.627", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2016-05-10T19:59:03.387", "references": [{"source": "cve@mitre.org", "url": "http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html"}, {"source": "cve@mitre.org", "url": "http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html"}, {"source": "cve@mitre.org", "url": "http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html"}, {"source": "cve@mitre.org", "url": "http://www.debian.org/security/2016/dsa-3625"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2016/05/06/3"}, {"source": "cve@mitre.org", "tags": ["Release Notes", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2016/05/06/5"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": 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"https://security.gentoo.org/glsa/201607-01"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.debian.org/security/2016/dsa-3625"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2016/05/06/3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2016/05/06/5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": 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{"affected_release": [{"advisory": "RHSA-2016:1138", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "squid-7:3.1.23-16.el6_8.4", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2016-05-31T00:00:00Z"}, {"advisory": "RHSA-2016:1140", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "squid34-7:3.4.14-9.el6_8.3", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2016-05-31T00:00:00Z"}, {"advisory": "RHSA-2016:1139", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "squid-7:3.3.8-26.el7_2.3", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2016-05-31T00:00:00Z"}], "bugzilla": {"description": "squid: SIGSEGV in ESIContext response handling", "id": "1334786", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1334786"}, "csaw": false, "cvss": {"cvss_base_score": "4.3", "cvss_scoring_vector": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "status": "verified"}, "cwe": "CWE-20", "details": ["Double free vulnerability in Esi.cc in Squid 3.x before 3.5.18 and 4.x before 4.0.10 allows remote servers to cause a denial of service (crash) via a crafted Edge Side Includes (ESI) response.", "An incorrect reference counting flaw was found in the way Squid processes ESI responses. If Squid is configured as reverse-proxy, for TLS/HTTPS interception, an attacker controlling a server accessed by Squid, could crash the squid worker, causing a Denial of Service attack."], "name": "CVE-2016-4556", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "squid", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2016-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2016-4556\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-4556\nhttp://www.squid-cache.org/Advisories/SQUID-2016_9.txt"], "threat_severity": "Moderate"}

{}