[NEW] [high] Cisco IOS XR: Multiple vulnerabilities enable unspecified attack
A remote, anonymous attacker can exploit multiple vulnerabilities in Cisco IOS XR to conduct an unspecified attack.
CSIRTS triage
- What
- Multiple vulnerabilities in Cisco IOS XR enable unspecified remote attacks from anonymous attackers.
- Who is affected
- Cisco IOS XR devices with remote network access.
- Urgency
- High severity; unspecified remote attack vectors from unauthenticated sources require urgent investigation.
- Action
- Review Cisco security advisories for IOS XR CVE-2026-20274 through CVE-2026-20280 and apply patches.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-3155
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-20274 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20275 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20276 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20277 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20278 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20279 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20280 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownCisco Products Multiple Vulnerabilitieshkcert
- criticalCisco IOS XR Software Security Hardening Release: September 2026cisco-psirt
- highCVE-2026-20280: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd
- criticalCVE-2026-20279: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd
- highCVE-2026-20278: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd
- highCVE-2026-20277: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd
- highCVE-2026-20276: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd
- highCVE-2026-20275: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd
- criticalCVE-2026-20274: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd
- criticalCisco Advance Notification for Publication of September 2, 2026, Security Advisoriescisco-psirt
Recent advisories for Cisco IOS XR
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- criticalCisco IOS XR Software Security Hardening Release: September 2026cisco-psirt · 2026-09-02
- highCVE-2026-20280: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd · 2026-09-02
- criticalCVE-2026-20279: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd · 2026-09-02
- highCVE-2026-20278: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd · 2026-09-02
- highCVE-2026-20277: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd · 2026-09-02
- highCVE-2026-20276: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS…nvd · 2026-09-02
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