The DNS-over-TCP implementation in Cisco IOS 12.2 and 15.0 through 15.3, when NAT is…
Priority LOW 38CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Complete
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
The DNS-over-TCP implementation in Cisco IOS 12.2 and 15.0 through 15.3, when NAT is used, allows remote attackers to cause a denial of service (device reload) via a crafted IPv4 DNS TCP stream, aka Bug ID CSCtn53730.
Why it matters now
EPSS 0.01887 79th 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 · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:* | 12.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios:15.0:*:*:*:*:*:*:* | 15.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios:15.1:*:*:*:*:*:*:* | 15.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios:15.2:*:*:*:*:*:*:* | 15.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios:15.3:*:*:*:*:*:*:* | 15.3 | Vulnerable | Cisco |
- cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:* Versions 12.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios:15.0:*:*:*:*:*:*:* Versions 15.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios:15.2:*:*:*:*:*:*:* Versions 15.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios:15.3:*:*:*:*:*:*:* Versions 15.3 Vulnerable ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2013-5479
- 2026-10-03 Alias added: GHSA-gqwp-6ggw-g8ph
References
More Cisco Ios vulnerabilities
- TI-2018-00138 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
- TI-2017-09019 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
- TI-2017-02977 Improper input validation in Cisco IOS and IOS XE Software KEVCVSS 3.1CRITICAL 9.8
- TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
- TI-2017-04499 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
- TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2013-5479 · CVE Program
- CVE-2013-5479 · NVD
- FIRST EPSS
- GHSA-gqwp-6ggw-g8ph · 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