High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-43612
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 13:03 UTC · Revision 1
Source evidence
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.
osv:CVE-2021-43612
Complete source record
{
"id": "17d1bbdb966caa18393429d3417786d2074d02023ef7f9c849c97f0447fb6e7c",
"url": "https://osv.dev/vulnerability/CVE-2021-43612",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-43612",
"summary": "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.",
"evidence": "osv:CVE-2021-43612",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-43612",
"aliases": [
"CVE-2021-43612"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/lldpd/lldpd",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "9576b78ec445b6570763deb93f0de8e68ba77f7e"
},
{
"fixed": "73d42680fce8598324364dbb31b9bc3b8320adf7"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:lldpd_project:lldpd:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.0.13"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "73d42680fce8598324364dbb31b9bc3b8320adf7"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"1.0.12",
"1.0.11",
"1.0.10",
"1.0.9",
"1.0.8",
"1.0.7",
"1.0.6",
"1.0.5",
"1.0.4",
"1.0.3",
"1.0.2",
"1.0.1",
"1.0.0",
"0.9.9",
"0.9.8",
"0.9.7",
"0.9.6",
"0.9.5",
"0.9.4",
"0.9.3",
"0.9.2",
"0.9.1",
"0.9.0",
"0.8.0",
"0.7.16",
"0.7.15",
"0.7.14",
"0.7.13",
"0.7.12",
"0.7.11",
"0.7.10",
"0.7.9",
"0.7.8",
"0.7.7",
"0.7.6",
"0.7.5",
"0.7.4",
"0.7.3",
"0.7.2",
"0.7.1",
"0.7.0",
"0.6.1",
"0.6.0",
"0.5.5",
"0.5.4",
"0.5.2",
"0.5.1",
"0.5.0",
"0.4.0",
"0.3.2",
"0.3.1",
"0.3",
"0.2.1",
"0.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43612.json",
"vanir_signatures": [
{
"id": "CVE-2021-43612-3f142231",
"digest": {
"threshold": 0.9,
"line_hashes": [
"174270931191069446119922332806983027230",
"328953425429319740967359908202123365019",
"148474301713841057780854757599060454972",
"303472043700785910045862048403819654472"
]
},
"source": "https://github.com/lldpd/lldpd/commit/73d42680fce8598324364dbb31b9bc3b8320adf7",
"target": {
"file": "src/daemon/protocols/sonmp.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2021-43612-be4181ed",
"digest": {
"threshold": 0.9,
"line_hashes": [
"123919934963719850177372057111646982388",
"85242646061938928223557171248857657613",
"290398165181504468760796425243008171327",
"73400390999848461393684333828551772347",
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"134033607636796134223854940512835876482",
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"75008514573464950100949670934350687236",
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"91295583977985738032834828095236946141",
"121648892500187250039971799308710356741",
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"42095772248954819309628834884020855252",
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]
},
"source": "https://github.com/lldpd/lldpd/commit/73d42680fce8598324364dbb31b9bc3b8320adf7",
"target": {
"file": "tests/check_sonmp.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2021-43612-ce80cd72",
"digest": {
"length": 1710,
"function_hash": "8385375709133268312520587891129635825"
},
"source": "https://github.com/lldpd/lldpd/commit/73d42680fce8598324364dbb31b9bc3b8320adf7",
"target": {
"file": "tests/check_sonmp.c",
"function": "START_TEST"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2021-43612-f8222931",
"digest": {
"length": 3756,
"function_hash": "31357405704987458856179538394491194529"
},
"source": "https://github.com/lldpd/lldpd/commit/73d42680fce8598324364dbb31b9bc3b8320adf7",
"target": {
"file": "src/daemon/protocols/sonmp.c",
"function": "sonmp_decode"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T14:34:28Z"
}
}
],
"modified": "2026-10-20T14:34:28.184880311Z",
"provider": "osv",
"references": [
"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://github.com/lldpd/lldpd/commit/73d42680fce8598324364dbb31b9bc3b8320adf7",
"https://github.com/lldpd/lldpd/compare/1.0.12...1.0.13",
"https://lldpd.github.io/security.html"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "36"
},
{
"last_affected": "36"
},
{
"introduced": "37"
},
{
"last_affected": "37"
},
{
"introduced": "38"
},
{
"last_affected": "38"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-43612",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 389722,
"published_at": "2023-04-15T22:15:07.033+00:00"
}