What’s Vulnerable › Vulnerabilities

CVE-2012-4502

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2013-11-05 · updated 2026-06-16
• Weakness: CWE-189

Description

Multiple integer overflows in pktlength.c in Chrony before 1.29 allow remote attackers to cause a denial of service (crash) via a crafted (1) REQ_SUBNETS_ACCESSED or (2) REQ_CLIENT_ACCESSES command request to the PKL_CommandLength function or crafted (3) RPY_SUBNETS_ACCESSED, (4) RPY_CLIENT_ACCESSES, (5) RPY_CLIENT_ACCESSES_BY_INDEX, or (6) RPY_MANUAL_LIST command reply to the PKL_ReplyLength function, which triggers an out-of-bounds read or buffer overflow. NOTE: versions 1.27 and 1.28 do not require authentication to exploit.

Affected products

• chrony: through 1.28; 1.0, 1.1, 1.18, 1.19, 1.19.99.1, 1.19.99.2 (+17)

References

• http://git.tuxfamily.org/chrony/chrony.git/?p=chrony/chrony.git%3Ba=commitdiff%3Bh=7712455d9aa33d0db0945effaa07e900b85987b1
• http://permalink.gmane.org/gmane.comp.time.chrony.announce/15
• http://seclists.org/oss-sec/2013/q3/332
• http://www.debian.org/security/2013/dsa-2760
• https://bugzilla.redhat.com/show_bug.cgi?id=846392
• http://git.tuxfamily.org/chrony/chrony.git/?p=chrony/chrony.git%3Ba=commitdiff%3Bh=7712455d9aa33d0db0945effaa07e900b85987b1
• http://permalink.gmane.org/gmane.comp.time.chrony.announce/15
• http://seclists.org/oss-sec/2013/q3/332
• http://www.debian.org/security/2013/dsa-2760
• https://bugzilla.redhat.com/show_bug.cgi?id=846392

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