Infinite loop in Cisco Unified Computing System
Priority LOW 35CWE-835Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- 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 3.1 · CNA. Fix status from CNA. Impact type from CWE-835.
Summary
A vulnerability in the Simple Network Management Protocol (SNMP) service of Cisco FXOS Software for Firepower 4100 Series and Firepower 9300 Security Appliances and of Cisco UCS 6300 Series Fabric Interconnects could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to the improper handling of specific SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: This vulnerability affects all supported SNMP versions. To exploit this vulnerability through SNMPv2c or earlier, an attacker must know the SNMP community string that is configured on an affected device. To exploit this vulnerability through SNMPv3, the attacker must have valid credentials for an SNMP user who is configured on the affected device.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00682 52nd 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 Unified Computing System (Managed) | 3.1(1e); 3.1(1g); 3.1(1h); 3.1(1k); 3.1(1l); 3.1(2b); 3.1(2c); 3.1(2e); 3.1(2f); 3.1(2g); 3.1(2h); 3.1(3a); 3.1(3b); 3.1(3c); 3.1(3d); 3.1(3e); 3.1(3f); 3.1(3h); 3.1(3j); 3.1(3k); 3.1(2d); 3.1(3l); 3.2(1d); 3.2(2b); 3.2(2c); 3.2(2d); 3.2(2e); 3.2(2f); 3.2(3a); 3.2(3b); 3.2(3d); 3.2(3e); 3.2(3g); 3.2(3h); 3.2(3i); 3.2(3j); 3.2(3k); 3.2(3l); 3.2(3n); 3.2(3o); 3.2(3p); 4.0(1a); 4.0(1b); 4.0(1c); 4.0(1d); 4.0(2a); 4.0(2b); 4.0(2d); 4.0(2e); 4.0(4b); 4.0(4c); 4.0(4d); 4.0(4e); 4.0(4f); 4.0(4g); 4.0(4h); 4.0(4a); 4.0(4i); 4.0(4k); 4.0(4l); 4.0(4m); 4.0(4n); 4.0(4o); 4.1(1a); 4.1(1b); 4.1(1c); 4.1(2a); 4.1(1d); 4.1(1e); 4.1(2b); 4.1(3a); 4.1(3b); 4.1(2c); 4.1(3d); 4.1(3c); 4.1(3e); 4.1(3f); 4.1(3h); 4.1(3i); 4.1(3j); 4.1(3k); 4.2(1d); 4.2(1c); 4.2(1f); 4.2(1i); 4.2(1k); 4.2(1l); 4.2(1m); 4.2(2a); 4.2(2c); 4.2(1n); 4.2(2d); 4.2(3b); 4.2(2e) | — | No fix listed | CNA |
| Cisco | Cisco Firepower Extensible Operating System (FXOS) | 2.2.1.63; 2.2.1.66; 2.2.1.70; 2.2.2.17; 2.2.2.19; 2.2.2.24; 2.2.2.26; 2.2.2.28; 2.2.2.54; 2.2.2.60; 2.3.1.93; 2.3.1.91; 2.3.1.88; 2.3.1.75; 2.3.1.73; 2.3.1.66; 2.3.1.58; 2.3.1.56 | — | No fix listed | CNA |
- Cisco Unified Computing System (Managed) VendorCisco Affected 3.1(1e); 3.1(1g); 3.1(1h); 3.1(1k); 3.1(1l); 3.1(2b); 3.1(2c); 3.1(2e); 3.1(2f); 3.1(2g); 3.1(2h); 3.1(3a); 3.1(3b); 3.1(3c); 3.1(3d); 3.1(3e); 3.1(3f); 3.1(3h); 3.1(3j); 3.1(3k); 3.1(2d); 3.1(3l); 3.2(1d); 3.2(2b); 3.2(2c); 3.2(2d); 3.2(2e); 3.2(2f); 3.2(3a); 3.2(3b); 3.2(3d); 3.2(3e); 3.2(3g); 3.2(3h); 3.2(3i); 3.2(3j); 3.2(3k); 3.2(3l); 3.2(3n); 3.2(3o); 3.2(3p); 4.0(1a); 4.0(1b); 4.0(1c); 4.0(1d); 4.0(2a); 4.0(2b); 4.0(2d); 4.0(2e); 4.0(4b); 4.0(4c); 4.0(4d); 4.0(4e); 4.0(4f); 4.0(4g); 4.0(4h); 4.0(4a); 4.0(4i); 4.0(4k); 4.0(4l); 4.0(4m); 4.0(4n); 4.0(4o); 4.1(1a); 4.1(1b); 4.1(1c); 4.1(2a); 4.1(1d); 4.1(1e); 4.1(2b); 4.1(3a); 4.1(3b); 4.1(2c); 4.1(3d); 4.1(3c); 4.1(3e); 4.1(3f); 4.1(3h); 4.1(3i); 4.1(3j); 4.1(3k); 4.2(1d); 4.2(1c); 4.2(1f); 4.2(1i); 4.2(1k); 4.2(1l); 4.2(1m); 4.2(2a); 4.2(2c); 4.2(1n); 4.2(2d); 4.2(3b); 4.2(2e) Fixed in — No fix listed CNA
- Cisco Firepower Extensible Operating System (FXOS) VendorCisco Affected 2.2.1.63; 2.2.1.66; 2.2.1.70; 2.2.2.17; 2.2.2.19; 2.2.2.24; 2.2.2.26; 2.2.2.28; 2.2.2.54; 2.2.2.60; 2.3.1.93; 2.3.1.91; 2.3.1.88; 2.3.1.75; 2.3.1.73; 2.3.1.66; 2.3.1.58; 2.3.1.56 Fixed in — No fix listed CNA
CPE configurations NVD · 16
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:firepower_9300_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Cisco |
| cpe:2.3:h:cisco:firepower_9300:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:firepower_4143_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Cisco |
| cpe:2.3:h:cisco:firepower_4145:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:firepower_4112_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Cisco |
| cpe:2.3:h:cisco:firepower_4112:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ucs_6324_fabric_interconnect_firmware:*:*:*:*:*:*:*:* | 4.1 to before 4.1\(3l\); 4.2 to before 4.2\(3d\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ucs_6324_fabric_interconnect:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:firepower_4125_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Cisco |
| cpe:2.3:h:cisco:firepower_4125:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:firepower_9300_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Cisco
- cpe:2.3:h:cisco:firepower_9300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:firepower_4143_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Cisco
- cpe:2.3:h:cisco:firepower_4145:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:firepower_4112_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Cisco
- cpe:2.3:h:cisco:firepower_4112:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ucs_6324_fabric_interconnect_firmware:*:*:*:*:*:*:*:* Versions 4.1 to before 4.1\(3l\); 4.2 to before 4.2\(3d\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ucs_6324_fabric_interconnect:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:firepower_4125_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Cisco
- cpe:2.3:h:cisco:firepower_4125:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 6 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:firepower_4115:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Cisco |
| cpe:2.3:h:cisco:firepower_4115:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ucs_6332_fabric_interconnect_firmware:*:*:*:*:*:*:*:* | 4.1 to before 4.1\(3l\); 4.2 – 4.2\(3b\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ucs_6332_fabric_interconnect:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ucs_6332-16up_fabric_interconnect_firmware:*:*:*:*:*:*:*:* | 4.1 to before 4.1\(3l\); 4.2 to before 4.2\(3b\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ucs_6332-16up_fabric_interconnect:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:firepower_4115:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Cisco
- cpe:2.3:h:cisco:firepower_4115:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ucs_6332_fabric_interconnect_firmware:*:*:*:*:*:*:*:* Versions 4.1 to before 4.1\(3l\); 4.2 – 4.2\(3b\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ucs_6332_fabric_interconnect:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ucs_6332-16up_fabric_interconnect_firmware:*:*:*:*:*:*:*:* Versions 4.1 to before 4.1\(3l\); 4.2 to before 4.2\(3b\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ucs_6332-16up_fabric_interconnect:-:*:*:*:*:*:*:* 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-2023-20200
- 2026-10-03 Alias added: GHSA-vrx2-vjh6-fhxx
References
Advisory 1
More Cisco Firepower 4112 Firmware vulnerabilities
- TI-2022-05424 Cisco FXOS Software Command Injection Vulnerability CVSS 3.1MEDIUM 6.7
Sources
- CVE-2023-20200 · CVE Program
- CVE-2023-20200 · NVD
- FIRST EPSS
- GHSA-vrx2-vjh6-fhxx · 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