Cisco IOS XR Software Intermediate System–to–Intermediate System Denial of Service Vulnerability
Priority LOW 32CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
A vulnerability in the implementation of the Intermediate System–to–Intermediate System (IS–IS) routing protocol functionality in Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the IS–IS process. The vulnerability is due to improper handling of a Simple Network Management Protocol (SNMP) request for specific Object Identifiers (OIDs) by the IS–IS process. An attacker could exploit this vulnerability by sending a crafted SNMP request to the affected device. A successful exploit could allow the attacker to cause a DoS condition in the IS–IS process.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01513 74th 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 | Cisco IOS XR Software | all versions | — | No fix listed | CNA |
- Cisco IOS XR Software VendorCisco Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 48
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xr:4.3.2:*:*:*:*:*:*:* | 4.3.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:xr_12404:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:xr_12406:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:xr_12410:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:xr_12416:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ios_xr:5.2.5:*:*:*:*:*:*:* | 5.2.5 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.2.2:*:*:*:*:*:*:* | 6.2.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.2.3:*:*:*:*:*:*:* | 6.2.3 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.2.25:*:*:*:*:*:*:* | 6.2.25 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.3.3:*:*:*:*:*:*:* | 6.3.3 | Vulnerable | Cisco |
- cpe:2.3:o:cisco:ios_xr:4.3.2:*:*:*:*:*:*:* Versions 4.3.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:xr_12404:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:xr_12406:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:xr_12410:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:xr_12416:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ios_xr:5.2.5:*:*:*:*:*:*:* Versions 5.2.5 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.2.2:*:*:*:*:*:*:* Versions 6.2.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.2.3:*:*:*:*:*:*:* Versions 6.2.3 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.2.25:*:*:*:*:*:*:* Versions 6.2.25 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.3.3:*:*:*:*:*:*:* Versions 6.3.3 Vulnerable ·Cisco
Show 38 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xr:6.4.2:*:*:*:*:*:*:* | 6.4.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ncs_6000:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:ncs_6008:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.1.3:*:*:*:*:*:*:* | 6.1.3 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.1.4:*:*:*:*:*:*:* | 6.1.4 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.5.2:*:*:*:*:*:*:* | 6.5.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:*:* | 6.5.3 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ncs_5001:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:ncs_5002:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:ncs_5011:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.3.15:*:*:*:*:*:*:* | 6.3.15 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.6.1:*:*:*:*:*:*:* | 6.6.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:*:* | 6.6.25 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ncs_5500:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:ncs_5501:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:ncs_5502:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:crs:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:* | 6.6.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:xrv_9000:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:ncs_560:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.1.2:*:*:*:*:*:*:* | 6.1.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:6.3.2:*:*:*:*:*:*:* | 6.3.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asr_9000:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9000v:v2:*:*:*:*:*:*:* | v2 | Running on | 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_9901:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:* | 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_9920:-:*:*:*:*:*:*:* | 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:6.4.2:*:*:*:*:*:*:* Versions 6.4.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ncs_6000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:ncs_6008:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.1.3:*:*:*:*:*:*:* Versions 6.1.3 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.1.4:*:*:*:*:*:*:* Versions 6.1.4 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.5.2:*:*:*:*:*:*:* Versions 6.5.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:*:* Versions 6.5.3 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ncs_5001:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:ncs_5002:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:ncs_5011:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.3.15:*:*:*:*:*:*:* Versions 6.3.15 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.6.1:*:*:*:*:*:*:* Versions 6.6.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:*:* Versions 6.6.25 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ncs_5500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:ncs_5501:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:ncs_5502:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:crs:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:* Versions 6.6.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:xrv_9000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:ncs_560:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.1.2:*:*:*:*:*:*:* Versions 6.1.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:6.3.2:*:*:*:*:*:*:* Versions 6.3.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:asr_9000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9000v:v2:*:*:*:*:*:*:* Versions v2 Running on ·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_9901:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:* 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_9920:-:*:*:*:*:*:*:* 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.
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Cisco IOS XR Software n/a
5 records Highest priority Priority MEDIUM 3 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2019-12057 Cisco IOS XR Software BGP EVPN Denial of Service VulnerabilitiesPriority MEDIUM 46
- TI-2019-12055 Cisco IOS XR Software BGP EVPN Denial of Service VulnerabilitiesPriority MEDIUM 46
- TI-2019-12029 Cisco IOS XR Software Border Gateway Protocol Attribute Denial of Service VulnerabilityPriority MEDIUM 46
Timeline
- 2026-10-02 Threatist record created from CVE-2019-16027
- 2026-10-03 Alias added: GHSA-69gf-2w85-7g9q
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-2019-16027 · CVE Program
- CVE-2019-16027 · NVD
- FIRST EPSS
- GHSA-69gf-2w85-7g9q · GitHub Advisory Database · CC BY 4.0
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