Resource management flaw in Cisco IOS XR
Priority LOW 34CWE-399Published · Updated
Key facts
- Attack vector
- Adjacent 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
A vulnerability in the UDP broadcast forwarding function of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on the affected device. The vulnerability is due to improper handling of UDP broadcast packets that are forwarded to an IPv4 helper address. An attacker could exploit this vulnerability by sending multiple UDP broadcast packets to the affected device. An exploit could allow the attacker to cause a buffer leak on the affected device, eventually resulting in a DoS condition requiring manual intervention to recover. This vulnerability affects all Cisco IOS XR platforms running 6.3.1, 6.2.3, or earlier releases of Cisco IOS XR Software when at least one IPv4 helper address is configured on an interface of the device. Cisco Bug IDs: CSCvi35625.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00823 57th 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
- None
- 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 |
|---|---|---|---|---|---|
| — | Cisco IOS XR | Cisco IOS XR | — | No fix listed | CNA |
- Cisco IOS XR Vendor— Affected Cisco IOS XR Fixed in — No fix listed CNA
CPE configurations NVD · 21
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xr:4.0.4.base:*:*:*:*:*:*:* | 4.0.4.base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:4.1.3.base:*:*:*:*:*:*:* | 4.1.3.base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:4.2.4.base:*:*:*:*:*:*:* | 4.2.4.base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:4.3.4.base:*:*:*:*:*:*:* | 4.3.4.base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:4.4.3.ce:*:*:*:*:*:*:* | 4.4.3.ce | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.0.3.ce:*:*:*:*:*:*:* | 5.0.3.ce | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.1.4.base:*:*:*:*:*:*:* | 5.1.4.base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.2.5.ce:*:*:*:*:*:*:* | 5.2.5.ce | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.3.4.base:*:*:*:*:*:*:* | 5.3.4.base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.4.3.ce:*:*:*:*:*:*:* | 5.4.3.ce | Vulnerable | Cisco |
- cpe:2.3:o:cisco:ios_xr:4.0.4.base:*:*:*:*:*:*:* Versions 4.0.4.base Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:4.1.3.base:*:*:*:*:*:*:* Versions 4.1.3.base Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:4.2.4.base:*:*:*:*:*:*:* Versions 4.2.4.base Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:4.3.4.base:*:*:*:*:*:*:* Versions 4.3.4.base Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:4.4.3.ce:*:*:*:*:*:*:* Versions 4.4.3.ce Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.0.3.ce:*:*:*:*:*:*:* Versions 5.0.3.ce Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.1.4.base:*:*:*:*:*:*:* Versions 5.1.4.base Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.2.5.ce:*:*:*:*:*:*:* Versions 5.2.5.ce Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.3.4.base:*:*:*:*:*:*:* Versions 5.3.4.base Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.4.3.ce:*:*:*:*:*:*:* Versions 5.4.3.ce Vulnerable ·Cisco
Show 11 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xr:6.0.4.base:*:*:*:*:*:*:* | 6.0.4.base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.1.4.base:*:*:*:*:*:*:* | 6.1.4.base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.2.3.base:*:*:*:*:*:*:* | 6.2.3.base | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:ios_xr:6.0.4.base:*:*:*:*:*:*:* Versions 6.0.4.base Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.1.4.base:*:*:*:*:*:*:* Versions 6.1.4.base Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.2.3.base:*:*:*:*:*:*:* Versions 6.2.3.base Vulnerable ·Cisco
- cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-0241
- 2026-10-03 Alias added: GHSA-73pp-cff4-vg2v
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-2018-0241 · CVE Program
- CVE-2018-0241 · NVD
- FIRST EPSS
- GHSA-73pp-cff4-vg2v · 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