CVE-2026-20272 (GCVE-0-2026-20272)
Vulnerability from cvelistv5 – Published: 2026-08-05 16:19 – Updated: 2026-08-06 03:55
VLAI
EPSS
VEX
Title
Cisco IOS XE Software Security Hardening Release
Summary
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.
The vulnerabilities tracked by CVE-2026-20272 are related to issues with improper neutralization of special elements that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-74.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco IOS XE Software |
Affected:
17.2.1a
Affected: 16.12.1y Affected: 16.12.3s Affected: 16.7.1b Affected: 16.6.2 Affected: 16.6.5 Affected: 16.12.1w Affected: 16.9.1d Affected: 17.3.1 Affected: 16.9.4c Affected: 16.7.1 Affected: 17.2.1 Affected: 16.6.8 Affected: 16.9.1b Affected: 16.9.2s Affected: 16.12.4 Affected: 16.12.3a Affected: 17.1.1s Affected: 16.11.1a Affected: 16.7.2 Affected: 16.11.1b Affected: 16.9.1s Affected: 16.9.3h Affected: 16.9.1c Affected: 16.6.5a Affected: 16.6.3 Affected: 16.10.1f Affected: 17.2.1v Affected: 16.8.1e Affected: 16.9.3a Affected: 16.12.1a Affected: 16.12.1x Affected: 16.6.4s Affected: 16.10.1c Affected: 16.12.3 Affected: 16.11.2 Affected: 16.6.5b Affected: 16.12.2s Affected: 16.10.1b Affected: 16.7.3 Affected: 16.6.7 Affected: 16.9.6 Affected: 16.9.2 Affected: 16.10.1 Affected: 16.12.1t Affected: 16.9.1 Affected: 16.8.1a Affected: 16.9.3s Affected: 16.6.7a Affected: 16.12.2 Affected: 16.11.1 Affected: 16.9.3 Affected: 16.11.1s Affected: 16.12.1 Affected: 17.1.1 Affected: 17.1.2 Affected: 16.10.1d Affected: 17.1.1t Affected: 16.9.4 Affected: 16.8.3 Affected: 16.12.2t Affected: 16.9.5 Affected: 16.8.1s Affected: 16.10.1e Affected: 16.8.2 Affected: 16.6.4 Affected: 16.8.1b Affected: 16.10.1a Affected: 16.12.1z Affected: 16.8.1c Affected: 16.9.1a Affected: 16.9.5f Affected: 16.6.4a Affected: 16.10.1g Affected: 16.8.1 Affected: 16.6.6 Affected: 16.9.2a Affected: 16.8.1d Affected: 16.10.3 Affected: 16.7.1a Affected: 16.11.1c Affected: 16.10.1s Affected: 17.2.1r Affected: 17.1.1a Affected: 16.10.2 Affected: 16.12.2a Affected: 16.12.1c Affected: 16.12.1s Affected: 16.7.4 Affected: 17.2.2 Affected: 16.9.8 Affected: 16.9.7 Affected: 17.1.3 Affected: 17.3.1a Affected: 17.3.2a Affected: 16.12.5 Affected: 17.3.1w Affected: 17.3.2 Affected: 17.4.1 Affected: 16.12.4a Affected: 17.4.1a Affected: 17.3.1x Affected: 17.3.3 Affected: 16.6.9 Affected: 17.2.3 Affected: 17.5.1 Affected: 16.12.1z1 Affected: 16.12.5a Affected: 17.4.1b Affected: 17.3.1z Affected: 16.12.5b Affected: 17.4.2 Affected: 17.3.3a Affected: 17.3.5 Affected: 17.3.4 Affected: 17.5.1a Affected: 16.12.6 Affected: 17.6.1 Affected: 16.12.1z2 Affected: 16.6.10 Affected: 17.3.4a Affected: 17.6.1a Affected: 17.7.1 Affected: 17.6.1x Affected: 17.6.2 Affected: 16.12.6a Affected: 17.3.4c Affected: 17.4.2a Affected: 17.3.4b Affected: 17.7.1a Affected: 16.12.7 Affected: 17.8.1a Affected: 17.6.3a Affected: 17.6.3 Affected: 17.7.2 Affected: 17.7.1b Affected: 17.9.1w Affected: 17.3.5a Affected: 17.6.1z Affected: 16.12.8 Affected: 17.8.1 Affected: 17.9.1 Affected: 17.6.4 Affected: 17.3.5b Affected: 17.9.1a Affected: 17.3.6 Affected: 17.10.1 Affected: 16.9.8a Affected: 17.6.1z1 Affected: 17.10.1a Affected: 17.9.2 Affected: 17.6.5 Affected: 17.9.1x Affected: 17.9.1y Affected: 16.9.8b Affected: 17.3.7 Affected: 17.9.2a Affected: 17.9.3 Affected: 16.12.9 Affected: 17.11.1 Affected: 17.10.1b Affected: 17.6.6 Affected: 17.9.1x1 Affected: 17.11.1a Affected: 17.9.3a Affected: 17.12.1 Affected: 17.3.8 Affected: 17.9.4 Affected: 16.12.10 Affected: 17.12.1w Affected: 17.9.1y1 Affected: 17.12.1a Affected: 17.9.5 Affected: 17.13.1 Affected: 17.12.1x Affected: 17.12.2 Affected: 17.14.1 Affected: 17.9.4a Affected: 17.3.8a Affected: 17.6.6a Affected: 17.6.5a Affected: 17.6.7 Affected: 16.12.10a Affected: 17.15.1 Affected: 17.13.1a Affected: 17.12.2a Affected: 16.12.11 Affected: 17.12.3 Affected: 17.12.1y Affected: 17.12.1z Affected: 17.9.5a Affected: 17.14.1a Affected: 17.9.5b Affected: 17.6.8 Affected: 16.12.12 Affected: 17.12.4 Affected: 17.9.6 Affected: 17.17.1 Affected: 17.16.1 Affected: 17.15.1w Affected: 17.12.3a Affected: 17.9.5c Affected: 17.15.1a Affected: 17.12.1z1 Affected: 17.15.2 Affected: 17.15.1b Affected: 17.9.5d Affected: 17.15.1x Affected: 17.9.6a Affected: 17.12.1z2 Affected: 17.6.8a Affected: 17.16.1a Affected: 16.12.13 Affected: 17.15.3 Affected: 17.9.7 Affected: 17.12.5 Affected: 17.15.1y Affected: 17.9.5e Affected: 17.12.4a Affected: 17.15.2a Affected: 17.15.2c Affected: 17.15.2b Affected: 17.12.1z3 Affected: 17.9.5f Affected: 17.12.4b Affected: 17.12.5a Affected: 17.18.1 Affected: 17.12.6 Affected: 17.12.1z4 Affected: 17.9.8 Affected: 17.9.7a Affected: 17.15.3a Affected: 17.15.4 Affected: 17.12.5b Affected: 17.15.3b Affected: 16.12.14 Affected: 17.18.1z Affected: 17.9.7b Affected: 17.12.5c Affected: 26.1.1 Affected: 17.18.1a Affected: 17.15.4a Affected: 17.18.2 Affected: 17.18.1w Affected: 17.15.4b Affected: 17.12.6a Affected: 17.12.7 Affected: 17.15.4c Affected: 17.9.9 Affected: 17.12.5d Affected: 16.12.15 Affected: 17.15.4s1 Affected: 17.15.5 Affected: 17.12.1z5 Affected: 17.18.1x Affected: 17.12.1z6 Affected: 17.15.4d Affected: 17.12.6b Affected: 17.4.1c Affected: 17.15.5a Affected: 17.18.1y Affected: 17.12.7a Affected: 17.18.3 Affected: 17.12.7b Affected: 17.18.3a Affected: 26.1.1a Affected: 17.15.7 Affected: 16.12.16 |
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{
"status": "affected",
"version": "17.9.5"
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"version": "17.13.1"
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"version": "17.12.1x"
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"status": "affected",
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"value": "As part of Cisco\u0027s ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20272 are related to issues with improper neutralization of special elements that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-74."
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"value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."
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"baseScore": 9.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"references": [
{
"name": "cisco-sa-hardening-iosxe-V8NMuMZJ",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ"
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"title": "Cisco IOS XE Software Security Hardening Release"
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{\"status\": \"affected\", \"version\": \"17.5.1\"}, {\"status\": \"affected\", \"version\": \"16.12.1z1\"}, {\"status\": \"affected\", \"version\": \"16.12.5a\"}, {\"status\": \"affected\", \"version\": \"17.4.1b\"}, {\"status\": \"affected\", \"version\": \"17.3.1z\"}, {\"status\": \"affected\", \"version\": \"16.12.5b\"}, {\"status\": \"affected\", \"version\": \"17.4.2\"}, {\"status\": \"affected\", \"version\": \"17.3.3a\"}, {\"status\": \"affected\", \"version\": \"17.3.5\"}, {\"status\": \"affected\", \"version\": \"17.3.4\"}, {\"status\": \"affected\", \"version\": \"17.5.1a\"}, {\"status\": \"affected\", \"version\": \"16.12.6\"}, {\"status\": \"affected\", \"version\": \"17.6.1\"}, {\"status\": \"affected\", \"version\": \"16.12.1z2\"}, {\"status\": \"affected\", \"version\": \"16.6.10\"}, {\"status\": \"affected\", \"version\": \"17.3.4a\"}, {\"status\": \"affected\", \"version\": \"17.6.1a\"}, {\"status\": \"affected\", \"version\": \"17.7.1\"}, {\"status\": \"affected\", \"version\": \"17.6.1x\"}, {\"status\": \"affected\", \"version\": \"17.6.2\"}, {\"status\": \"affected\", \"version\": \"16.12.6a\"}, {\"status\": \"affected\", \"version\": \"17.3.4c\"}, {\"status\": \"affected\", \"version\": \"17.4.2a\"}, {\"status\": \"affected\", \"version\": \"17.3.4b\"}, {\"status\": \"affected\", \"version\": \"17.7.1a\"}, {\"status\": \"affected\", \"version\": \"16.12.7\"}, {\"status\": \"affected\", \"version\": \"17.8.1a\"}, {\"status\": \"affected\", \"version\": \"17.6.3a\"}, {\"status\": \"affected\", \"version\": \"17.6.3\"}, {\"status\": \"affected\", \"version\": \"17.7.2\"}, {\"status\": \"affected\", \"version\": \"17.7.1b\"}, {\"status\": \"affected\", \"version\": \"17.9.1w\"}, {\"status\": \"affected\", \"version\": \"17.3.5a\"}, {\"status\": \"affected\", \"version\": \"17.6.1z\"}, {\"status\": \"affected\", \"version\": \"16.12.8\"}, {\"status\": \"affected\", \"version\": \"17.8.1\"}, {\"status\": \"affected\", \"version\": \"17.9.1\"}, {\"status\": \"affected\", \"version\": \"17.6.4\"}, {\"status\": \"affected\", \"version\": \"17.3.5b\"}, {\"status\": \"affected\", \"version\": \"17.9.1a\"}, {\"status\": \"affected\", \"version\": \"17.3.6\"}, {\"status\": \"affected\", \"version\": \"17.10.1\"}, {\"status\": \"affected\", \"version\": \"16.9.8a\"}, {\"status\": \"affected\", \"version\": \"17.6.1z1\"}, {\"status\": \"affected\", \"version\": \"17.10.1a\"}, {\"status\": \"affected\", \"version\": \"17.9.2\"}, {\"status\": \"affected\", \"version\": \"17.6.5\"}, {\"status\": \"affected\", \"version\": \"17.9.1x\"}, {\"status\": \"affected\", \"version\": \"17.9.1y\"}, {\"status\": \"affected\", \"version\": \"16.9.8b\"}, {\"status\": \"affected\", \"version\": \"17.3.7\"}, {\"status\": \"affected\", \"version\": \"17.9.2a\"}, {\"status\": \"affected\", \"version\": \"17.9.3\"}, {\"status\": \"affected\", \"version\": \"16.12.9\"}, {\"status\": \"affected\", \"version\": \"17.11.1\"}, {\"status\": \"affected\", \"version\": \"17.10.1b\"}, {\"status\": \"affected\", \"version\": \"17.6.6\"}, {\"status\": \"affected\", \"version\": \"17.9.1x1\"}, {\"status\": \"affected\", \"version\": \"17.11.1a\"}, {\"status\": \"affected\", \"version\": \"17.9.3a\"}, {\"status\": \"affected\", \"version\": \"17.12.1\"}, {\"status\": \"affected\", \"version\": \"17.3.8\"}, {\"status\": \"affected\", \"version\": \"17.9.4\"}, {\"status\": \"affected\", \"version\": \"16.12.10\"}, {\"status\": \"affected\", \"version\": \"17.12.1w\"}, {\"status\": \"affected\", \"version\": \"17.9.1y1\"}, {\"status\": \"affected\", \"version\": \"17.12.1a\"}, {\"status\": \"affected\", \"version\": \"17.9.5\"}, {\"status\": \"affected\", \"version\": \"17.13.1\"}, {\"status\": \"affected\", \"version\": \"17.12.1x\"}, {\"status\": \"affected\", \"version\": \"17.12.2\"}, {\"status\": \"affected\", \"version\": \"17.14.1\"}, {\"status\": \"affected\", \"version\": \"17.9.4a\"}, {\"status\": \"affected\", \"version\": \"17.3.8a\"}, {\"status\": \"affected\", \"version\": \"17.6.6a\"}, {\"status\": \"affected\", \"version\": \"17.6.5a\"}, {\"status\": \"affected\", \"version\": \"17.6.7\"}, {\"status\": \"affected\", \"version\": \"16.12.10a\"}, {\"status\": \"affected\", \"version\": \"17.15.1\"}, {\"status\": \"affected\", \"version\": \"17.13.1a\"}, {\"status\": \"affected\", \"version\": \"17.12.2a\"}, {\"status\": \"affected\", \"version\": \"16.12.11\"}, {\"status\": \"affected\", \"version\": \"17.12.3\"}, {\"status\": \"affected\", \"version\": \"17.12.1y\"}, {\"status\": \"affected\", \"version\": \"17.12.1z\"}, {\"status\": \"affected\", \"version\": \"17.9.5a\"}, {\"status\": \"affected\", \"version\": \"17.14.1a\"}, {\"status\": \"affected\", \"version\": \"17.9.5b\"}, {\"status\": \"affected\", \"version\": \"17.6.8\"}, {\"status\": \"affected\", \"version\": \"16.12.12\"}, {\"status\": \"affected\", \"version\": \"17.12.4\"}, {\"status\": \"affected\", \"version\": \"17.9.6\"}, {\"status\": \"affected\", \"version\": \"17.17.1\"}, {\"status\": \"affected\", \"version\": \"17.16.1\"}, {\"status\": \"affected\", \"version\": \"17.15.1w\"}, {\"status\": \"affected\", \"version\": \"17.12.3a\"}, {\"status\": \"affected\", \"version\": \"17.9.5c\"}, {\"status\": \"affected\", \"version\": \"17.15.1a\"}, {\"status\": \"affected\", \"version\": \"17.12.1z1\"}, {\"status\": \"affected\", \"version\": \"17.15.2\"}, {\"status\": \"affected\", \"version\": \"17.15.1b\"}, {\"status\": \"affected\", \"version\": \"17.9.5d\"}, {\"status\": \"affected\", \"version\": \"17.15.1x\"}, {\"status\": \"affected\", \"version\": \"17.9.6a\"}, {\"status\": \"affected\", \"version\": \"17.12.1z2\"}, {\"status\": \"affected\", \"version\": \"17.6.8a\"}, {\"status\": \"affected\", \"version\": \"17.16.1a\"}, {\"status\": \"affected\", \"version\": \"16.12.13\"}, {\"status\": \"affected\", \"version\": \"17.15.3\"}, {\"status\": \"affected\", \"version\": \"17.9.7\"}, {\"status\": \"affected\", \"version\": \"17.12.5\"}, {\"status\": \"affected\", \"version\": \"17.15.1y\"}, {\"status\": \"affected\", \"version\": \"17.9.5e\"}, {\"status\": \"affected\", \"version\": \"17.12.4a\"}, {\"status\": \"affected\", \"version\": \"17.15.2a\"}, {\"status\": \"affected\", \"version\": \"17.15.2c\"}, {\"status\": \"affected\", \"version\": \"17.15.2b\"}, {\"status\": \"affected\", \"version\": \"17.12.1z3\"}, {\"status\": \"affected\", \"version\": \"17.9.5f\"}, {\"status\": \"affected\", \"version\": \"17.12.4b\"}, {\"status\": \"affected\", \"version\": \"17.12.5a\"}, {\"status\": \"affected\", \"version\": \"17.18.1\"}, {\"status\": \"affected\", \"version\": \"17.12.6\"}, {\"status\": \"affected\", \"version\": \"17.12.1z4\"}, {\"status\": \"affected\", \"version\": \"17.9.8\"}, {\"status\": \"affected\", \"version\": \"17.9.7a\"}, {\"status\": \"affected\", \"version\": \"17.15.3a\"}, {\"status\": \"affected\", \"version\": \"17.15.4\"}, {\"status\": \"affected\", \"version\": \"17.12.5b\"}, {\"status\": \"affected\", \"version\": \"17.15.3b\"}, {\"status\": \"affected\", \"version\": \"16.12.14\"}, {\"status\": \"affected\", \"version\": \"17.18.1z\"}, {\"status\": \"affected\", \"version\": \"17.9.7b\"}, {\"status\": \"affected\", \"version\": \"17.12.5c\"}, {\"status\": \"affected\", \"version\": \"26.1.1\"}, {\"status\": \"affected\", \"version\": \"17.18.1a\"}, {\"status\": \"affected\", \"version\": \"17.15.4a\"}, {\"status\": \"affected\", \"version\": \"17.18.2\"}, {\"status\": \"affected\", \"version\": \"17.18.1w\"}, {\"status\": \"affected\", \"version\": \"17.15.4b\"}, {\"status\": \"affected\", \"version\": \"17.12.6a\"}, {\"status\": \"affected\", \"version\": \"17.12.7\"}, {\"status\": \"affected\", \"version\": \"17.15.4c\"}, {\"status\": \"affected\", \"version\": \"17.9.9\"}, {\"status\": \"affected\", \"version\": \"17.12.5d\"}, {\"status\": \"affected\", \"version\": \"16.12.15\"}, {\"status\": \"affected\", \"version\": \"17.15.4s1\"}, {\"status\": \"affected\", \"version\": \"17.15.5\"}, {\"status\": \"affected\", \"version\": \"17.12.1z5\"}, {\"status\": \"affected\", \"version\": \"17.18.1x\"}, {\"status\": \"affected\", \"version\": \"17.12.1z6\"}, {\"status\": \"affected\", \"version\": \"17.15.4d\"}, {\"status\": \"affected\", \"version\": \"17.12.6b\"}, {\"status\": \"affected\", \"version\": \"17.4.1c\"}, {\"status\": \"affected\", \"version\": \"17.15.5a\"}, {\"status\": \"affected\", \"version\": \"17.18.1y\"}, {\"status\": \"affected\", \"version\": \"17.12.7a\"}, {\"status\": \"affected\", \"version\": \"17.18.3\"}, {\"status\": \"affected\", \"version\": \"17.12.7b\"}, {\"status\": \"affected\", \"version\": \"17.18.3a\"}, {\"status\": \"affected\", \"version\": \"26.1.1a\"}, {\"status\": \"affected\", \"version\": \"17.15.7\"}, {\"status\": \"affected\", \"version\": \"16.12.16\"}], \"defaultStatus\": \"unknown\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ\", \"name\": \"cisco-sa-hardening-iosxe-V8NMuMZJ\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"As part of Cisco\u0027s ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.\\r\\n\\r\\nThe vulnerabilities tracked by CVE-2026-20272 are related to issues with improper neutralization of special elements that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-74.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-74\", \"description\": \"Improper Neutralization of Special Elements in Output Used by a Downstream Component (\u0027Injection\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-08-05T16:19:26.541Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20272\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-06T03:55:48.271Z\", \"dateReserved\": \"2025-10-08T11:59:15.403Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-08-05T16:19:26.541Z\", \"assignerShortName\": \"cisco\"}",
"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.
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