What’s Vulnerable › Vulnerabilities

CVE-2021-43612

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-04-15 · updated 2026-06-17
• Weakness: CWE-787

Description

In lldpd before 1.0.13, when decoding SONMP packets in the sonmp_decode function, it's possible to trigger an out-of-bounds heap read via short SONMP packets.

Affected products

• Fedoraproject Fedora: 36, 37, 38
• lldpd: before 1.0.13 — fixed in 1.0.13

How to fix

Upgrade to a fixed version: lldpd 1.0.13. Check the vendor advisory for mitigations.

References

• https://github.com/lldpd/lldpd/commit/73d42680fce8598324364dbb31b9bc3b8320adf7
• https://github.com/lldpd/lldpd/compare/1.0.12...1.0.13
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3T5XHPOGIPWCRRPJUE6P3HVC5PTSD5JS/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JYA4AMJXCNF6UPFG36L2TPPT32C242SP/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKQWHG2SZJZSGC7PXVDAEJYBN7ESDR7D/
• https://lldpd.github.io/security.html
• https://github.com/lldpd/lldpd/commit/73d42680fce8598324364dbb31b9bc3b8320adf7
• https://github.com/lldpd/lldpd/compare/1.0.12...1.0.13
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3T5XHPOGIPWCRRPJUE6P3HVC5PTSD5JS/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JYA4AMJXCNF6UPFG36L2TPPT32C242SP/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKQWHG2SZJZSGC7PXVDAEJYBN7ESDR7D/
• https://lldpd.github.io/security.html

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