01 Record

CVE-2021-43612

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.

HighPUBLISHEDCNA: mitre

CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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02 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.

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.14% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 66.5% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2023-04-15 00:00Z3 YR AGO

Last updated

2025-02-13 16:28Z1 YR AGO

Reserved

2021-11-12

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE-787Out-of-bounds WriteBase
CWE-125Out-of-bounds ReadBase

Data version

5.1

Document digest

626366ebfb1f64482302c7078f007ebfde5935a0e43519ecf8fed8d4cb7595ee

05 Affected products

VendorProductVersionsPlatforms

fedoraprojectfedoraNot specified—

lldpd_projectlldpdNot specified—

redhatenterprise_linuxNot specified—

06 References

lldpd.github.iohttps://lldpd.github.io/security.html
github.comhttps://github.com/lldpd/lldpd/commit/73d42680fce8598324364dbb31b9bc3b8320adf7
github.comhttps://github.com/lldpd/lldpd/compare/1.0.12...1.0.13
lists.fedoraproject.orgFEDORA-2023-88991d2713https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JYA4AMJXCNF6UPFG36L2TPPT32C242SP/vendor-advisory
lists.fedoraproject.orgFEDORA-2023-c0c184a019https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3T5XHPOGIPWCRRPJUE6P3HVC5PTSD5JS/vendor-advisory
lists.fedoraproject.orgFEDORA-2023-3e4feeadechttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKQWHG2SZJZSGC7PXVDAEJYBN7ESDR7D/vendor-advisory

07 Fixed in

AlmaLinux 9

lldpd
Fixed in 1.0.18-4.el9
lldpd-devel
Fixed in 1.0.18-4.el9

CloudLinux 9

lldpd
Fixed in 1.0.18-4.el9
lldpd-devel
Fixed in 1.0.18-4.el9

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Debian 12

lldpd
Fixed in 1.0.13-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

lldpd
Fixed in 1.0.13-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

lldpd
Fixed in 1.0.13-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.