CVE-2026-20277

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.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxr-qg64NcM
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-02 17:17

Updated : 2026-09-15 18:17

NVD link : CVE-2026-20277

Mitre link : CVE-2026-20277

CVE.ORG link : CVE-2026-20277

JSON object : View

Products Affected

No product.

CWE

CWE-693

Protection Mechanism Failure

{"id": "CVE-2026-20277", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20277", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-02T16:49:28.450902Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "psirt@cisco.com", "cvssData": {"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"}, "impactScore": 4.2, "exploitabilityScore": 3.9}]}, "affected": [{"source": "psirt@cisco.com", "affectedData": [{"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"}]}], "published": "2026-09-02T17:17:33.110", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxr-qg64NcM", "source": "psirt@cisco.com"}, {"url": "https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-693"}]}], "descriptions": [{"lang": "en", "value": "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.\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."}], "lastModified": "2026-09-15T18:17:19.230", "sourceIdentifier": "psirt@cisco.com"}