CVE-2026-20277

HIGH

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 resul...

Affects 0 products across 1 vendor.

CVSS 3.18.2
EPSS0.2%
Percentile13th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, no confidentiality impact, full availability impact.
CWE Weakness Definitions
CWE-693: CWE-693
Related Attack Patterns (CAPEC)
CAPEC-51 Poison Web Service Registry
via CWE-693
CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
via CWE-693
CAPEC-59 Session Credential Falsification through Prediction
via CWE-693
CAPEC-65 Sniff Application Code
via CWE-693
CAPEC-107 Cross Site Tracing
via CWE-693
Show all 17

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

A high severity vulnerability (CVE-2026-20277) affects the target system. 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 mul...

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Frequently Asked Questions
What is CVE-2026-20277?
A high severity vulnerability (CVE-2026-20277) affects the target system. 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 mul...
What is the CVSS score for CVE-2026-20277?
CVE-2026-20277 has CVSS 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H. EPSS: 0.2%.
Is CVE-2026-20277 actively exploited?
No confirmed active exploitation of CVE-2026-20277 as of 2026-09-25.
How do I remediate CVE-2026-20277?
Apply vendor patches for CVE-2026-20277. Monitor Cisco advisories.
What systems are affected by CVE-2026-20277?
CVE-2026-20277 affects: Cisco.
Vulnerability Details
CVE IDCVE-2026-20277
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Published2026-09-02
Last Modified2026-09-18
ICS Relevance55%
Weakness (CWE)
CWE-693
SourceNVD
Official Description

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.

Source: NIST NVD / MITRE CVE Database

Affected Products
VendorProductFixed Version
Cisco — —
Remediation

No patch URL on record. Monitor vendor security advisories directly.

Threat Intelligence
● Threat Intelligence Validated: September 2026 | Threat Age: 25 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
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