Out-of-bounds write in Cisco Identity Services Engine Software
Priority LOW 20CWE-787Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
A vulnerability in the CDP processing feature of Cisco ISE could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition of the CDP process on an affected device. This vulnerability is due to insufficient bounds checking when an affected device processes CDP traffic. An attacker could exploit this vulnerability by sending crafted CDP traffic to the device. A successful exploit could cause the CDP process to crash, impacting neighbor discovery and the ability of Cisco ISE to determine the reachability of remote devices. After a crash, the CDP process must be manually restarted using the cdp enable command in interface configuration mode.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00338 27th 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 Identity Services Engine Software | 2.6.0; 2.6.0 p1; 2.6.0 p2; 2.6.0 p3; 2.6.0 p5; 2.6.0 p6; 2.6.0 p7; 2.6.0 p8; 2.6.0 p9; 2.6.0 p10; 2.6.0 p11; 2.6.0 p12; 2.7.0; 2.7.0 p1; 2.7.0 p2; 2.7.0 p3; 2.7.0 p4; 2.7.0 p5; 2.7.0 p6; 2.7.0 p7; 2.7.0 p9; 3.0.0; 3.0.0 p1; 3.0.0 p2; 3.0.0 p3; 3.0.0 p4; 3.0.0 p5; 3.0.0 p6; 3.1.0; 3.1.0 p1; 3.1.0 p3; 3.1.0 p4; 3.1.0 p5; 3.1.0 p7; 3.2.0; 3.2.0 p1 | — | No fix listed | CNA |
- Cisco Identity Services Engine Software VendorCisco Affected 2.6.0; 2.6.0 p1; 2.6.0 p2; 2.6.0 p3; 2.6.0 p5; 2.6.0 p6; 2.6.0 p7; 2.6.0 p8; 2.6.0 p9; 2.6.0 p10; 2.6.0 p11; 2.6.0 p12; 2.7.0; 2.7.0 p1; 2.7.0 p2; 2.7.0 p3; 2.7.0 p4; 2.7.0 p5; 2.7.0 p6; 2.7.0 p7; 2.7.0 p9; 3.0.0; 3.0.0 p1; 3.0.0 p2; 3.0.0 p3; 3.0.0 p4; 3.0.0 p5; 3.0.0 p6; 3.1.0; 3.1.0 p1; 3.1.0 p3; 3.1.0 p4; 3.1.0 p5; 3.1.0 p7; 3.2.0; 3.2.0 p1 Fixed in — No fix listed CNA
CPE configurations NVD · 25
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cisco:identity_services_engine:2.7.0:-:*:*:*:*:*:* | 2.7.0 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch1:*:*:*:*:*:* | 2.7.0 patch1 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch2:*:*:*:*:*:* | 2.7.0 patch2 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch3:*:*:*:*:*:* | 2.7.0 patch3 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch4:*:*:*:*:*:* | 2.7.0 patch4 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch5:*:*:*:*:*:* | 2.7.0 patch5 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch6:*:*:*:*:*:* | 2.7.0 patch6 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch7:*:*:*:*:*:* | 2.7.0 patch7 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch8:*:*:*:*:*:* | 2.7.0 patch8 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch9:*:*:*:*:*:* | 2.7.0 patch9 | Vulnerable | Cisco |
- cpe:2.3:a:cisco:identity_services_engine:2.7.0:-:*:*:*:*:*:* Versions 2.7.0 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch1:*:*:*:*:*:* Versions 2.7.0 patch1 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch2:*:*:*:*:*:* Versions 2.7.0 patch2 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch3:*:*:*:*:*:* Versions 2.7.0 patch3 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch4:*:*:*:*:*:* Versions 2.7.0 patch4 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch5:*:*:*:*:*:* Versions 2.7.0 patch5 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch6:*:*:*:*:*:* Versions 2.7.0 patch6 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch7:*:*:*:*:*:* Versions 2.7.0 patch7 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch8:*:*:*:*:*:* Versions 2.7.0 patch8 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch9:*:*:*:*:*:* Versions 2.7.0 patch9 Vulnerable ·Cisco
Show 15 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cisco:identity_services_engine:3.0.0:-:*:*:*:*:*:* | 3.0.0 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch1:*:*:*:*:*:* | 3.0.0 patch1 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch2:*:*:*:*:*:* | 3.0.0 patch2 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch3:*:*:*:*:*:* | 3.0.0 patch3 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch4:*:*:*:*:*:* | 3.0.0 patch4 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch5:*:*:*:*:*:* | 3.0.0 patch5 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch6:*:*:*:*:*:* | 3.0.0 patch6 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.1:-:*:*:*:*:*:* | 3.1 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.1:patch1:*:*:*:*:*:* | 3.1 patch1 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.1:patch2:*:*:*:*:*:* | 3.1 patch2 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.1:patch3:*:*:*:*:*:* | 3.1 patch3 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.1:patch4:*:*:*:*:*:* | 3.1 patch4 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.1:patch5:*:*:*:*:*:* | 3.1 patch5 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.2:-:*:*:*:*:*:* | 3.2 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:identity_services_engine:3.2:patch1:*:*:*:*:*:* | 3.2 patch1 | Vulnerable | Cisco |
- cpe:2.3:a:cisco:identity_services_engine:3.0.0:-:*:*:*:*:*:* Versions 3.0.0 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch1:*:*:*:*:*:* Versions 3.0.0 patch1 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch2:*:*:*:*:*:* Versions 3.0.0 patch2 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch3:*:*:*:*:*:* Versions 3.0.0 patch3 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch4:*:*:*:*:*:* Versions 3.0.0 patch4 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch5:*:*:*:*:*:* Versions 3.0.0 patch5 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch6:*:*:*:*:*:* Versions 3.0.0 patch6 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.1:-:*:*:*:*:*:* Versions 3.1 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.1:patch1:*:*:*:*:*:* Versions 3.1 patch1 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.1:patch2:*:*:*:*:*:* Versions 3.1 patch2 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.1:patch3:*:*:*:*:*:* Versions 3.1 patch3 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.1:patch4:*:*:*:*:*:* Versions 3.1 patch4 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.1:patch5:*:*:*:*:*:* Versions 3.1 patch5 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.2:-:*:*:*:*:*:* Versions 3.2 Vulnerable ·Cisco
- cpe:2.3:a:cisco:identity_services_engine:3.2:patch1:*:*:*:*:*:* Versions 3.2 patch1 Vulnerable ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-20213
- 2026-10-03 Alias added: GHSA-wrrj-56x5-rfqr
References
Advisory 1
More Cisco Identity Services Engine vulnerabilities
- TI-2026-53488 Cisco Identity Services Engine Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
- TI-2025-14632 Cisco ISE API Unauthenticated Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0
- TI-2025-14578 Cisco ISE API Unauthenticated Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0
- TI-2021-19919 Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints KEVCVSS 3.1CRITICAL 10.0
- TI-2025-14579 Cisco ISE API Unauthenticated Remote Code Execution Vulnerability CVSS 3.1CRITICAL 10.0
- TI-2022-05522 OS command injection in Cisco Identity Services Engine Software CVSS 3.1HIGH 8.8
Sources
- CVE-2023-20213 · CVE Program
- CVE-2023-20213 · NVD
- FIRST EPSS
- GHSA-wrrj-56x5-rfqr · 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