Vulnerability · Published Apr 15, 2023 · Assigned by mitre
CVE-2021-43612
High 7.5
In plain English
A high-severity out-of-bounds write in the lldpd package (AlmaLinux). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 67% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.1%top 33.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:9 | lldpd | 1.0.18-4.el9 | ALSA-2024:9158 |
| AlmaLinux:9 | lldpd-devel | 1.0.18-4.el9 | ALSA-2024:9158 |
| Alpine:v3.20 | lldpd | 1.0.13-r0 | ALPINE-CVE-2021-43612 |
| Alpine:v3.21 | lldpd | 1.0.13-r0 | ALPINE-CVE-2021-43612 |
| Alpine:v3.22 | lldpd | 1.0.13-r0 | ALPINE-CVE-2021-43612 |
| Alpine:v3.23 | lldpd | 1.0.13-r0 | ALPINE-CVE-2021-43612 |
| Alpine:v3.24 | lldpd | 1.0.13-r0 | ALPINE-CVE-2021-43612 |
| Debian:12 | lldpd | 1.0.13-1 | DEBIAN-CVE-2021-43612 |
| Debian:13 | lldpd | 1.0.13-1 | DEBIAN-CVE-2021-43612 |
| Debian:14 | lldpd | 1.0.13-1 | DEBIAN-CVE-2021-43612 |
| Rocky Linux:9 | lldpd | 0:1.0.18-4.el9 | RLSA-2024:9158 |
| Ubuntu:22.04:LTS | lldpd | no fix listed | UBUNTU-CVE-2021-43612 |
| Ubuntu:24.04:LTS | lldpd | no fix listed | UBUNTU-CVE-2021-43612 |
| Ubuntu:25.10 | lldpd | no fix listed | UBUNTU-CVE-2021-43612 |
| Ubuntu:26.04:LTS | lldpd | no fix listed | UBUNTU-CVE-2021-43612 |
| Ubuntu:26.10 | lldpd | no fix listed | UBUNTU-CVE-2021-43612 |
Affected products (as reported)
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H