CVE-2026-59679 (GCVE-0-2026-59679)
Vulnerability from cvelistv5 – Published: 2026-09-10 08:15 – Updated: 2026-09-10 12:45
VLAI
EPSS
VEX
Title
fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2
Summary
fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) indexes the per-character encoding[] array using num_chars from the FS_QueryXBitmaps16 reply, but that array was allocated with a size derived from num_extents in the separate FS_QueryXExtents16 reply. The two CARD32 fields are never cross-checked.
A malicious or compromised font server can send a small num_extents (e.g. 1) in the extents reply, then a large num_chars (e.g. 100000) in the bitmaps reply. This causes attacker-controlled out-of-bounds heap read and writes.
Severity
9 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 12:44 UTC
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
1 reference
Impacted products
80 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| SUSE | Container suse/kiosk/tigervnc-x11vnc:1.14-63.8 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Container suse/kiosk/xorg:21.1-83.7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Azure-3P |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Azure-3P |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-GCE-3P |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAPCAL-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAPCAL-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAPCAL-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-Azure |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-Azure-3P |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-BYOS-Azure |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-BYOS-EC2 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-BYOS-GCE |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-GCE |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-GCE-3P |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAPCAL-GCE |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-Azure-SAP-BYOS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-Azure-SAP-On-Demand |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-EC2-SAP-BYOS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-EC2-SAP-On-Demand |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-GCE-SAP-BYOS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-GCE-SAP-On-Demand |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Liberty Linux 10 |
Affected:
? , < 2.0.6-5.el10_2.3
(custom)
|
guessed | |
| SUSE | SUSE Liberty Linux 8 |
Affected:
? , < 2.0.3-2.el8_10.3
(custom)
|
guessed | |
| SUSE | SUSE Liberty Linux 9 |
Affected:
? , < 2.0.3-12.el9_8.3
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Desktop 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Module for Basesystem 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 12 SP5-LTSS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP4-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP5-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP6-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 16.0 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP applications 16.0 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP4 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP5 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP6 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Manager Proxy LTS 4.3 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Manager Retail Branch Server LTS 4.3 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Manager Server LTS 4.3 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | openSUSE Leap 16.0 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | openSUSE Tumbleweed |
Affected:
? , < 2.0.7-3.1
(custom)
|
guessed | |
| libXfont2 | libXfont2 |
Affected:
? , ≤ 2.0.8
(custom)
|
guessed |
Date Public
2026-08-05 08:10
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-59679",
"options": [
{
"Exploitation": "none"
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{
"Automatable": "no"
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"Technical Impact": "total"
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"timestamp": "2026-09-10T12:44:48.987855Z",
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{
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{
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{
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{
"defaultStatus": "unaffected",
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{
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-BYOS-GCE",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
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"version": "?",
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]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-EC2",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-GCE",
"vendor": "SUSE",
"versions": [
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{
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{
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{
"defaultStatus": "unaffected",
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{
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},
{
"defaultStatus": "unaffected",
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"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-Hardened-BYOS-EC2",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
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"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-Hardened-EC2",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-Hardened-GCE",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL-Azure",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL-EC2",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL-GCE",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
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"title": "libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write",
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\"?\", \"lessThan\": \"2.0.7-3.1\", \"versionType\": \"custom\"}], \"packageName\": \"libXfont2-2-32bit\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"SUSE\", \"product\": \"openSUSE Tumbleweed\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"lessThan\": \"2.0.7-3.1\", \"versionType\": \"custom\"}], \"packageName\": \"libXfont2-devel\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"SUSE\", \"product\": \"openSUSE Tumbleweed\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"lessThan\": \"2.0.7-3.1\", \"versionType\": \"custom\"}], \"packageName\": \"libXfont2-devel-32bit\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"libXfont2\", \"product\": \"libXfont2\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"2.0.8\"}], \"packageName\": \"libXfont2\", \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-08-05T08:10:00.000Z\", \"references\": [{\"url\": \"https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-59679\"}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) indexes the per-character encoding[] array using num_chars from the FS_QueryXBitmaps16 reply, but that array was allocated with a size derived from num_extents in the separate FS_QueryXExtents16 reply. The two CARD32 fields are never cross-checked.\\nA malicious or compromised font server can send a small num_extents (e.g. 1) in the extents reply, then a large num_chars (e.g. 100000) in the bitmaps reply. This causes attacker-controlled out-of-bounds heap read and writes.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cpre\u003efs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) indexes the per-character encoding[] array using num_chars from the FS_QueryXBitmaps16 reply, but that array was allocated with a size derived from num_extents in the separate FS_QueryXExtents16 reply. The two CARD32 fields are never cross-checked.\u003cbr\u003eA malicious or compromised font server can send a small num_extents (e.g. 1) in the extents reply, then a large num_chars (e.g. 100000) in the bitmaps reply. This causes attacker-controlled out-of-bounds heap read and writes. \u003c/pre\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"404e59f5-483d-4b8a-8e7a-e67604dd8afb\", \"shortName\": \"suse\", \"dateUpdated\": \"2026-09-10T08:15:24.892Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-59679\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-10T12:45:33.969Z\", \"dateReserved\": \"2026-07-06T11:59:28.119Z\", \"assignerOrgId\": \"404e59f5-483d-4b8a-8e7a-e67604dd8afb\", \"datePublished\": \"2026-09-10T08:15:24.892Z\", \"assignerShortName\": \"suse\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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