A vulnerability in the forwarding component of Cisco IOS XR Software for Cisco Network…
Key facts
- Attack vector
- Local
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
Summary
A vulnerability in the forwarding component of Cisco IOS XR Software for Cisco Network Convergence System (NCS) 5500 Series Routers could allow an authenticated, local attacker to cause the router to stop forwarding data traffic across Traffic Engineering (TE) tunnels, resulting in a denial of service (DoS) condition. More Information: CSCvd16665. Known Affected Releases: 6.2.11.BASE. Known Fixed Releases: 6.1.3 6.1.2 6.3.1.8i.BASE 6.2.11.8i.BASE 6.2.2.9i.BASE 6.1.32.11i.BASE 6.1.31.10i.BASE 6.1.4.3i.BASE.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Cisco Network Convergence System 5500 Series Routers | Cisco Network Convergence System 5500 Series Routers | — | No fix listed | CNA |
- Cisco Network Convergence System 5500 Series Routers Vendor— Affected Cisco Network Convergence System 5500 Series Routers Fixed in — No fix listed CNA
CPE configurations NVD · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xr:6.0.0:*:*:*:*:*:*:* | 6.0.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.0.1:*:*:*:*:*:*:* | 6.0.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.0_base:*:*:*:*:*:*:* | 6.0_base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.1.0:*:*:*:*:*:*:* | 6.1.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.1.1:*:*:*:*:*:*:* | 6.1.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.1.2:*:*:*:*:*:*:* | 6.1.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.1.3:*:*:*:*:*:*:* | 6.1.3 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.2.0:*:*:*:*:*:*:* | 6.2.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.2.1:*:*:*:*:*:*:* | 6.2.1 | Vulnerable | Cisco |
- cpe:2.3:o:cisco:ios_xr:6.0.0:*:*:*:*:*:*:* Versions 6.0.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.0.1:*:*:*:*:*:*:* Versions 6.0.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.0_base:*:*:*:*:*:*:* Versions 6.0_base Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.1.0:*:*:*:*:*:*:* Versions 6.1.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.1.1:*:*:*:*:*:*:* Versions 6.1.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.1.2:*:*:*:*:*:*:* Versions 6.1.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.1.3:*:*:*:*:*:*:* Versions 6.1.3 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.2.0:*:*:*:*:*:*:* Versions 6.2.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.2.1:*:*:*:*:*:*:* Versions 6.2.1 Vulnerable ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2017-6666
- 2026-10-03 Alias added: GHSA-f277-hhxj-fvx5
References
More Cisco Ios Xr vulnerabilities
- TI-2020-02680 Cisco IOS XR Software Cisco Discovery Protocol Format String Vulnerability KEVCVSS 3.1HIGH 8.8
- TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
- TI-2020-03113 Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities KEVCVSS 3.1HIGH 8.6
- TI-2020-03110 Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability KEVCVSS 3.1HIGH 8.6
- TI-2018-00142 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.0
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
Sources
- CVE-2017-6666 · CVE Program
- CVE-2017-6666 · NVD
- FIRST EPSS
- GHSA-f277-hhxj-fvx5 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences