CVE-2026-20277 (GCVE-0-2026-20277)
Vulnerability from cvelistv5 – Published: 2026-09-02 16:13 – Updated: 2026-09-02 17:58
VLAI
EPSS
VEX
Title
Cisco IOS XR Software Security Hardening Release: September 2026
Summary
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities.
The vulnerabilities tracked by CVE-2026-20277 are related to protection mechanism failure issues that are grouped under the Common Weakness Enumeration (CWE) CWE-693.
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 16:49 UTC
CWE
- CWE-693 - Protection Mechanism Failure
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Cisco | Cisco IOS XR Software |
Affected:
6.5.29
Affected: 7.0.1 Affected: 6.5.26 Affected: 6.5.25 Affected: 6.5.28 Affected: 6.5.90 Affected: 7.1.1 Affected: 7.0.90 Affected: 6.7.1 Affected: 7.0.2 Affected: 7.1.15 Affected: 7.2.1 Affected: 7.1.2 Affected: 6.7.2 Affected: 7.0.11 Affected: 7.0.12 Affected: 7.0.14 Affected: 7.1.25 Affected: 7.2.12 Affected: 7.3.1 Affected: 7.1.3 Affected: 6.7.3 Affected: 7.4.1 Affected: 7.2.2 Affected: 6.7.4 Affected: 6.5.31 Affected: 7.3.15 Affected: 7.3.16 Affected: 6.8.1 Affected: 7.4.15 Affected: 6.5.32 Affected: 7.3.2 Affected: 7.5.1 Affected: 7.4.16 Affected: 7.3.27 Affected: 7.6.1 Affected: 7.5.2 Affected: 7.8.1 Affected: 7.6.15 Affected: 7.5.12 Affected: 7.8.12 Affected: 7.3.3 Affected: 7.7.1 Affected: 6.8.2 Affected: 7.3.4 Affected: 7.4.2 Affected: 6.7.35 Affected: 6.9.1 Affected: 7.6.2 Affected: 7.5.3 Affected: 7.7.2 Affected: 6.9.2 Affected: 7.9.1 Affected: 7.10.1 Affected: 7.8.2 Affected: 7.5.4 Affected: 6.5.33 Affected: 7.8.22 Affected: 7.7.21 Affected: 7.9.2 Affected: 7.3.5 Affected: 7.5.5 Affected: 7.11.1 Affected: 7.9.21 Affected: 7.10.2 Affected: 24.1.1 Affected: 7.6.3 Affected: 7.3.6 Affected: 7.5.52 Affected: 7.11.2 Affected: 24.2.1 Affected: 24.1.2 Affected: 24.2.11 Affected: 24.3.1 Affected: 24.4.1 Affected: 24.2.2 Affected: 7.8.23 Affected: 7.11.21 Affected: 24.2.20 Affected: 24.3.2 Affected: 24.4.10 Affected: 6.5.35 Affected: 25.1.1 Affected: 24.4.2 Affected: 24.3.20 Affected: 24.4.15 Affected: 25.2.1 Affected: 6.5.351 Affected: 25.1.2 Affected: 24.3.30 Affected: 25.3.1 Affected: 6.5.352 Affected: 24.4.30 Affected: 24.2.21 Affected: 25.4.1 Affected: 25.2.2 Affected: 25.2.15 Affected: 7.2.0 Affected: 7.0.0 Affected: 25.2.30 Affected: 6.5.353 Affected: 26.1.1 Affected: 25.1.30 Affected: 25.3.15 Affected: 26.2.100 Affected: 25.4.2 Affected: 26.2.1 Affected: 25.4.30 Affected: 26.1.2 Affected: 25.4.201 Affected: 26.2.101 |
guessed |
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Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-693\"}]}],\"references\":[{\"url\":\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxr-qg64NcM\",\"source\":\"psirt@cisco.com\"}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20277\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-02T16:49:28.450902Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-02T17:56:53.444Z\"}}], \"cna\": {\"title\": \"Cisco IOS XR Software Security Hardening Release: September 2026\", \"source\": {\"defects\": [\"CSCwu47185\"], \"advisory\": \"cisco-sa-hardening-iosxr-qg64NcM\", \"discovery\": \"INTERNAL\"}, \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.2, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"Cisco\", \"product\": \"Cisco IOS XR Software\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.5.29\"}, {\"status\": \"affected\", \"version\": \"7.0.1\"}, {\"status\": \"affected\", \"version\": \"6.5.26\"}, {\"status\": \"affected\", \"version\": \"6.5.25\"}, {\"status\": \"affected\", \"version\": \"6.5.28\"}, {\"status\": \"affected\", \"version\": \"6.5.90\"}, {\"status\": \"affected\", \"version\": \"7.1.1\"}, {\"status\": \"affected\", \"version\": \"7.0.90\"}, {\"status\": \"affected\", \"version\": \"6.7.1\"}, {\"status\": \"affected\", \"version\": \"7.0.2\"}, {\"status\": \"affected\", \"version\": \"7.1.15\"}, {\"status\": \"affected\", \"version\": \"7.2.1\"}, {\"status\": \"affected\", \"version\": \"7.1.2\"}, {\"status\": \"affected\", \"version\": \"6.7.2\"}, {\"status\": \"affected\", \"version\": \"7.0.11\"}, {\"status\": \"affected\", \"version\": \"7.0.12\"}, {\"status\": \"affected\", \"version\": \"7.0.14\"}, {\"status\": \"affected\", \"version\": \"7.1.25\"}, {\"status\": \"affected\", \"version\": \"7.2.12\"}, {\"status\": \"affected\", \"version\": \"7.3.1\"}, {\"status\": \"affected\", \"version\": \"7.1.3\"}, {\"status\": \"affected\", \"version\": \"6.7.3\"}, {\"status\": \"affected\", \"version\": \"7.4.1\"}, {\"status\": \"affected\", \"version\": \"7.2.2\"}, {\"status\": \"affected\", \"version\": \"6.7.4\"}, {\"status\": \"affected\", \"version\": \"6.5.31\"}, {\"status\": \"affected\", \"version\": \"7.3.15\"}, {\"status\": \"affected\", \"version\": \"7.3.16\"}, {\"status\": \"affected\", \"version\": \"6.8.1\"}, {\"status\": \"affected\", \"version\": \"7.4.15\"}, {\"status\": \"affected\", \"version\": \"6.5.32\"}, {\"status\": \"affected\", \"version\": \"7.3.2\"}, {\"status\": \"affected\", \"version\": \"7.5.1\"}, {\"status\": \"affected\", \"version\": \"7.4.16\"}, {\"status\": \"affected\", \"version\": \"7.3.27\"}, {\"status\": \"affected\", \"version\": \"7.6.1\"}, {\"status\": \"affected\", \"version\": \"7.5.2\"}, {\"status\": \"affected\", \"version\": \"7.8.1\"}, {\"status\": \"affected\", \"version\": \"7.6.15\"}, {\"status\": \"affected\", \"version\": \"7.5.12\"}, {\"status\": \"affected\", \"version\": \"7.8.12\"}, {\"status\": \"affected\", \"version\": \"7.3.3\"}, {\"status\": \"affected\", \"version\": \"7.7.1\"}, {\"status\": \"affected\", \"version\": \"6.8.2\"}, {\"status\": \"affected\", \"version\": \"7.3.4\"}, {\"status\": \"affected\", \"version\": \"7.4.2\"}, {\"status\": \"affected\", \"version\": \"6.7.35\"}, {\"status\": \"affected\", \"version\": \"6.9.1\"}, {\"status\": \"affected\", \"version\": \"7.6.2\"}, {\"status\": \"affected\", \"version\": \"7.5.3\"}, {\"status\": \"affected\", \"version\": \"7.7.2\"}, {\"status\": \"affected\", \"version\": \"6.9.2\"}, {\"status\": \"affected\", \"version\": \"7.9.1\"}, {\"status\": \"affected\", \"version\": \"7.10.1\"}, {\"status\": \"affected\", \"version\": \"7.8.2\"}, {\"status\": \"affected\", \"version\": \"7.5.4\"}, {\"status\": \"affected\", \"version\": \"6.5.33\"}, {\"status\": \"affected\", \"version\": \"7.8.22\"}, {\"status\": \"affected\", \"version\": \"7.7.21\"}, {\"status\": \"affected\", \"version\": \"7.9.2\"}, {\"status\": \"affected\", \"version\": \"7.3.5\"}, {\"status\": \"affected\", \"version\": \"7.5.5\"}, {\"status\": \"affected\", \"version\": \"7.11.1\"}, {\"status\": \"affected\", \"version\": \"7.9.21\"}, {\"status\": \"affected\", \"version\": \"7.10.2\"}, {\"status\": \"affected\", \"version\": \"24.1.1\"}, {\"status\": \"affected\", \"version\": \"7.6.3\"}, {\"status\": \"affected\", \"version\": \"7.3.6\"}, {\"status\": \"affected\", \"version\": \"7.5.52\"}, {\"status\": \"affected\", \"version\": \"7.11.2\"}, {\"status\": \"affected\", \"version\": \"24.2.1\"}, {\"status\": \"affected\", \"version\": \"24.1.2\"}, {\"status\": \"affected\", \"version\": \"24.2.11\"}, {\"status\": \"affected\", \"version\": \"24.3.1\"}, {\"status\": \"affected\", \"version\": \"24.4.1\"}, {\"status\": \"affected\", \"version\": \"24.2.2\"}, {\"status\": \"affected\", \"version\": \"7.8.23\"}, {\"status\": \"affected\", \"version\": \"7.11.21\"}, {\"status\": \"affected\", \"version\": \"24.2.20\"}, {\"status\": \"affected\", \"version\": \"24.3.2\"}, {\"status\": \"affected\", \"version\": \"24.4.10\"}, {\"status\": \"affected\", \"version\": \"6.5.35\"}, {\"status\": \"affected\", \"version\": \"25.1.1\"}, {\"status\": \"affected\", \"version\": \"24.4.2\"}, {\"status\": \"affected\", \"version\": \"24.3.20\"}, {\"status\": \"affected\", \"version\": \"24.4.15\"}, {\"status\": \"affected\", \"version\": \"25.2.1\"}, {\"status\": \"affected\", \"version\": \"6.5.351\"}, {\"status\": \"affected\", \"version\": \"25.1.2\"}, {\"status\": \"affected\", \"version\": \"24.3.30\"}, {\"status\": \"affected\", \"version\": \"25.3.1\"}, {\"status\": \"affected\", \"version\": \"6.5.352\"}, {\"status\": \"affected\", \"version\": \"24.4.30\"}, {\"status\": \"affected\", \"version\": \"24.2.21\"}, {\"status\": \"affected\", \"version\": \"25.4.1\"}, {\"status\": \"affected\", \"version\": \"25.2.2\"}, {\"status\": \"affected\", \"version\": \"25.2.15\"}, {\"status\": \"affected\", \"version\": \"7.2.0\"}, {\"status\": \"affected\", \"version\": \"7.0.0\"}, {\"status\": \"affected\", \"version\": \"25.2.30\"}, {\"status\": \"affected\", \"version\": \"6.5.353\"}, {\"status\": \"affected\", \"version\": \"26.1.1\"}, {\"status\": \"affected\", \"version\": \"25.1.30\"}, {\"status\": \"affected\", \"version\": \"25.3.15\"}, {\"status\": \"affected\", \"version\": \"26.2.100\"}, {\"status\": \"affected\", \"version\": \"25.4.2\"}, {\"status\": \"affected\", \"version\": \"26.2.1\"}, {\"status\": \"affected\", \"version\": \"25.4.30\"}, {\"status\": \"affected\", \"version\": \"26.1.2\"}, {\"status\": \"affected\", \"version\": \"25.4.201\"}, {\"status\": \"affected\", \"version\": \"26.2.101\"}], \"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-iosxr-qg64NcM\", \"name\": \"cisco-sa-hardening-iosxr-qg64NcM\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"As part of Cisco\u0027s ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities.\\r\\n\\r\\nThe vulnerabilities tracked by CVE-2026-20277 are related to protection mechanism failure issues that are grouped under the Common Weakness Enumeration (CWE) CWE-693.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-693\", \"description\": \"Protection Mechanism Failure\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-09-02T16:13:11.709Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20277\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-02T17:58:59.278Z\", \"dateReserved\": \"2025-10-08T11:59:15.403Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-09-02T16:13:11.709Z\", \"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.
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.
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.
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