CVE-2021-43612: fedoraproject fedora Out-of-bounds Write
Vulnerability summary
CVE-2021-43612 is a high (CVSS 7.5) Out-of-bounds Write vulnerability in fedoraproject fedora. EPSS estimates a 1.14% chance of exploitation in the next 30 days, higher than 66.7% of scored vulnerabilities.
Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2Timeline
- 15-04-2023PublishedVulnerability first disclosed.
- 13-02-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.14%
Chance of exploitation in the next 30 days
Percentile
67%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.14% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- lldpd< 1.0.13-r0
Debian1 product
- lldpd< 1.0.13-1
Fedoraproject1 product
- fedoraEOL36 | 37 | 38
Lldpd_project1 product
- lldpd< 1.0.13
Opensuse1 product
- lldpd&distro=openSUSE Tumbleweed< 1.0.13-1.1
Ubuntu1 product
- lldpdAll versions (No fix recorded)
6 vendors · 6 products
References
11 links- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
