Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service…
Priority HIGH 84Exploited in the wildCWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session reset) via a BGP UPDATE message with an invalid attribute, as demonstrated in the wild on 17 August 2009.
Why it matters now
Exploitation Active In CISA KEV since 2022-03-25CISA due date 2022-04-15
EPSS 0.03314 88th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Active
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
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 · 19
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xr:3.4:*:*:*:*:*:*:* | 3.4 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.4.0:*:*:*:*:*:*:* | 3.4.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.4.1:*:*:*:*:*:*:* | 3.4.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.4.2:*:*:*:*:*:*:* | 3.4.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.4.3:*:*:*:*:*:*:* | 3.4.3 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.5:*:*:*:*:*:*:* | 3.5 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.5.2:*:*:*:*:*:*:* | 3.5.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.5.3:*:*:*:*:*:*:* | 3.5.3 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.5.4:*:*:*:*:*:*:* | 3.5.4 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.6.0:*:*:*:*:*:*:* | 3.6.0 | Vulnerable | Cisco |
- cpe:2.3:o:cisco:ios_xr:3.4:*:*:*:*:*:*:* Versions 3.4 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.4.0:*:*:*:*:*:*:* Versions 3.4.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.4.1:*:*:*:*:*:*:* Versions 3.4.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.4.2:*:*:*:*:*:*:* Versions 3.4.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.4.3:*:*:*:*:*:*:* Versions 3.4.3 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.5:*:*:*:*:*:*:* Versions 3.5 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.5.2:*:*:*:*:*:*:* Versions 3.5.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.5.3:*:*:*:*:*:*:* Versions 3.5.3 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.5.4:*:*:*:*:*:*:* Versions 3.5.4 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.6.0:*:*:*:*:*:*:* Versions 3.6.0 Vulnerable ·Cisco
Show 9 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xr:3.6.1:*:*:*:*:*:*:* | 3.6.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.6.2:*:*:*:*:*:*:* | 3.6.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.6.3:*:*:*:*:*:*:* | 3.6.3 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.7.0:*:*:*:*:*:*:* | 3.7.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.7.1:*:*:*:*:*:*:* | 3.7.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.7.2:*:*:*:*:*:*:* | 3.7.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.7.3:*:*:*:*:*:*:* | 3.7.3 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.8.0:*:*:*:*:*:*:* | 3.8.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:3.8.1:*:*:*:*:*:*:* | 3.8.1 | Vulnerable | Cisco |
- cpe:2.3:o:cisco:ios_xr:3.6.1:*:*:*:*:*:*:* Versions 3.6.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.6.2:*:*:*:*:*:*:* Versions 3.6.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.6.3:*:*:*:*:*:*:* Versions 3.6.3 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.7.0:*:*:*:*:*:*:* Versions 3.7.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.7.1:*:*:*:*:*:*:* Versions 3.7.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.7.2:*:*:*:*:*:*:* Versions 3.7.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.7.3:*:*:*:*:*:*:* Versions 3.7.3 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.8.0:*:*:*:*:*:*:* Versions 3.8.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:3.8.1:*:*:*:*:*:*:* Versions 3.8.1 Vulnerable ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2022-03-25 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2009-2055
- 2026-10-03 Alias added: GHSA-2j56-f322-jxrm
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-2009-2055 · CVE Program
- CVE-2009-2055 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-2j56-f322-jxrm · 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