Cisco IOS XR 5.x through 5.2.5 on NCS 6000 devices allows remote attackers to cause a…
Priority LOW 37CWE-399Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.
Summary
Cisco IOS XR 5.x through 5.2.5 on NCS 6000 devices allows remote attackers to cause a denial of service (timer consumption and Route Processor reload) via crafted SSH traffic, aka Bug ID CSCux76819.
Why it matters now
EPSS 0.01939 80th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 15
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:h:cisco:network_convergence_system_6000:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.0.0:*:*:*:*:*:*:* | 5.0.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.0.1:*:*:*:*:*:*:* | 5.0.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.0_base:*:*:*:*:*:*:* | 5.0_base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.1.0:*:*:*:*:*:*:* | 5.1.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.1.1:*:*:*:*:*:*:* | 5.1.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.1.1.k9sec:*:*:*:*:*:*:* | 5.1.1.k9sec | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.1.2:*:*:*:*:*:*:* | 5.1.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.1.3:*:*:*:*:*:*:* | 5.1.3 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.2.0:*:*:*:*:*:*:* | 5.2.0 | Vulnerable | Cisco |
- cpe:2.3:h:cisco:network_convergence_system_6000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.0.0:*:*:*:*:*:*:* Versions 5.0.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.0.1:*:*:*:*:*:*:* Versions 5.0.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.0_base:*:*:*:*:*:*:* Versions 5.0_base Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.1.0:*:*:*:*:*:*:* Versions 5.1.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.1.1:*:*:*:*:*:*:* Versions 5.1.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.1.1.k9sec:*:*:*:*:*:*:* Versions 5.1.1.k9sec Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.1.2:*:*:*:*:*:*:* Versions 5.1.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.1.3:*:*:*:*:*:*:* Versions 5.1.3 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.2.0:*:*:*:*:*:*:* Versions 5.2.0 Vulnerable ·Cisco
Show 5 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xr:5.2.1:*:*:*:*:*:*:* | 5.2.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.2.2:*:*:*:*:*:*:* | 5.2.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.2.3:*:*:*:*:*:*:* | 5.2.3 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.2.4:*:*:*:*:*:*:* | 5.2.4 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.2.5:*:*:*:*:*:*:* | 5.2.5 | Vulnerable | Cisco |
- cpe:2.3:o:cisco:ios_xr:5.2.1:*:*:*:*:*:*:* Versions 5.2.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.2.2:*:*:*:*:*:*:* Versions 5.2.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.2.3:*:*:*:*:*:*:* Versions 5.2.3 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.2.4:*:*:*:*:*:*:* Versions 5.2.4 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.2.5:*:*:*:*:*:*:* Versions 5.2.5 Vulnerable ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2016-1426
- 2026-10-03 Alias added: GHSA-2vvf-m6gh-56m4
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-2016-1426 · CVE Program
- CVE-2016-1426 · NVD
- FIRST EPSS
- GHSA-2vvf-m6gh-56m4 · 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