Resource management flaw in Cisco StarOS 18.x through 21.x
Priority LOW 36CWE-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
A vulnerability in the Slowpath of StarOS for Cisco ASR 5500 Series routers with Data Processing Card 2 (DPC2) could allow an unauthenticated, remote attacker to cause a subset of the subscriber sessions to be disconnected, resulting in a partial denial of service (DoS) condition. This vulnerability affects Cisco ASR 5500 devices with Data Processing Card 2 (DPC2) running StarOS 18.0 or later. More Information: CSCvb12081. Known Affected Releases: 18.7.4 19.5.0 20.0.2.64048 20.2.3 21.0.0. Known Fixed Releases: 18.7.4 18.7.4.65030 18.8.M0.65044 19.5.0 19.5.0.65092 19.5.M0.65023 19.5.M0.65050 20.2.3 20.2.3.64982 20.2.3.65017 20.2.a4.65307 20.3.M0.64984 20.3.M0.65029 20.3.M0.65037 20.3.M0.65071 20.3.T0.64985 20.3.T0.65031 20.3.T0.65043 20.3.T0.65067 21.0.0 21.0.0.65256 21.0.M0.64922 21.0.M0.64983 21.0.M0.65140 21.0.V0.65150 21.1.A0.64932 21.1.A0.64987 21.1.A0.65145 21.1.PP0.65270 21.1.R0.65130 21.1.R0.65135 21.1.R0.65154 21.1.VC0.65203 21.2.A0.65147.
Why it matters now
EPSS 0.01747 77th 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 |
|---|---|---|---|---|---|
| — | Cisco StarOS 18.x through 21.x | Cisco StarOS 18.x through 21.x | — | No fix listed | CNA |
- Cisco StarOS 18.x through 21.x Vendor— Affected Cisco StarOS 18.x through 21.x Fixed in — No fix listed CNA
CPE configurations NVD · 22
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:asr_5000_software:18.0.0:*:*:*:*:*:*:* | 18.0.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:18.0.0.57828:*:*:*:*:*:*:* | 18.0.0.57828 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:18.0.0.59167:*:*:*:*:*:*:* | 18.0.0.59167 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:18.0.0.59211:*:*:*:*:*:*:* | 18.0.0.59211 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:18.0.l0.59219:*:*:*:*:*:*:* | 18.0.l0.59219 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:18.1.0:*:*:*:*:*:*:* | 18.1.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:18.1.0.59776:*:*:*:*:*:*:* | 18.1.0.59776 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:18.1.0.59780:*:*:*:*:*:*:* | 18.1.0.59780 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:18.1_base:*:*:*:*:*:*:* | 18.1_base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:18.3.0:*:*:*:*:*:*:* | 18.3.0 | Vulnerable | Cisco |
- cpe:2.3:o:cisco:asr_5000_software:18.0.0:*:*:*:*:*:*:* Versions 18.0.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:18.0.0.57828:*:*:*:*:*:*:* Versions 18.0.0.57828 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:18.0.0.59167:*:*:*:*:*:*:* Versions 18.0.0.59167 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:18.0.0.59211:*:*:*:*:*:*:* Versions 18.0.0.59211 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:18.0.l0.59219:*:*:*:*:*:*:* Versions 18.0.l0.59219 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:18.1.0:*:*:*:*:*:*:* Versions 18.1.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:18.1.0.59776:*:*:*:*:*:*:* Versions 18.1.0.59776 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:18.1.0.59780:*:*:*:*:*:*:* Versions 18.1.0.59780 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:18.1_base:*:*:*:*:*:*:* Versions 18.1_base Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:18.3.0:*:*:*:*:*:*:* Versions 18.3.0 Vulnerable ·Cisco
Show 12 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:asr_5000_software:18.3_base:*:*:*:*:*:*:* | 18.3_base | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:18.4.0:*:*:*:*:*:*:* | 18.4.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:19.0.1:*:*:*:*:*:*:* | 19.0.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:19.0.m0.60737:*:*:*:*:*:*:* | 19.0.m0.60737 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:19.0.m0.60828:*:*:*:*:*:*:* | 19.0.m0.60828 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:19.0.m0.61045:*:*:*:*:*:*:* | 19.0.m0.61045 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:19.1.0:*:*:*:*:*:*:* | 19.1.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:19.1.0.61559:*:*:*:*:*:*:* | 19.1.0.61559 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:19.2.0:*:*:*:*:*:*:* | 19.2.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:19.3.0:*:*:*:*:*:*:* | 19.3.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asr_5000_software:20.0.0:*:*:*:*:*:*:* | 20.0.0 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asr_5500:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:asr_5000_software:18.3_base:*:*:*:*:*:*:* Versions 18.3_base Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:18.4.0:*:*:*:*:*:*:* Versions 18.4.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:19.0.1:*:*:*:*:*:*:* Versions 19.0.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:19.0.m0.60737:*:*:*:*:*:*:* Versions 19.0.m0.60737 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:19.0.m0.60828:*:*:*:*:*:*:* Versions 19.0.m0.60828 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:19.0.m0.61045:*:*:*:*:*:*:* Versions 19.0.m0.61045 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:19.1.0:*:*:*:*:*:*:* Versions 19.1.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:19.1.0.61559:*:*:*:*:*:*:* Versions 19.1.0.61559 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:19.2.0:*:*:*:*:*:*:* Versions 19.2.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:19.3.0:*:*:*:*:*:*:* Versions 19.3.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asr_5000_software:20.0.0:*:*:*:*:*:*:* Versions 20.0.0 Vulnerable ·Cisco
- cpe:2.3:h:cisco:asr_5500:-:*:*:*:*:*:*:* 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-2016-6455
- 2026-10-03 Alias added: GHSA-c5xh-8h52-w9w3
References
More Cisco Asr 5000 Software vulnerabilities
- TI-2017-04484 A vulnerability in the Border Gateway Protocol (BGP) processing functionality of the… CVSS 3.0HIGH 7.5
- TI-2016-01324 The General Packet Radio Switching Tunneling Protocol 1 (aka GTPv1) implementation on… CVSS 3.0HIGH 7.5
- TI-2016-01340 Cisco ASR 5000 devices with software 18.3 through 20.0.0 allow remote attackers to make… CVSS 3.0MEDIUM 6.5
- TI-2017-04527 Improper input validation in Cisco StarOS for ASR 5000 Series Aggregated Services Routers CVSS 3.0MEDIUM 6.7
- TI-2015-05325 The Proxy Mobile IPv6 (PMIPv6) component in the CDMA implementation on Cisco ASR 5000… CVSS 2.0MEDIUM 5.0
- TI-2015-05321 Cisco ASR 5000 and 5500 devices with software 18.0.0.57828 and 19.0.M0.61045 allow remote… CVSS 2.0MEDIUM 5.0
Sources
- CVE-2016-6455 · CVE Program
- CVE-2016-6455 · NVD
- FIRST EPSS
- GHSA-c5xh-8h52-w9w3 · 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