Cisco AsyncOS on Email Security Appliance (ESA) devices with software 8.5.6-073…
Priority LOW 25CWE-399Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.
Summary
Cisco AsyncOS on Email Security Appliance (ESA) devices with software 8.5.6-073, 8.5.6-074, and 9.0.0-461, when clustering is enabled, allows remote attackers to cause a denial of service (clustering and SSH outage) via a packet flood, aka Bug IDs CSCur13704 and CSCuq05636.
Why it matters now
EPSS 0.02377 83rd 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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:h:cisco:email_security_appliance:8.5.6-074:*:*:*:*:*:*:* | 8.5.6-074 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:email_security_appliance_firmware:8.5.6-073:*:*:*:*:*:*:* | 8.5.6-073 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:email_security_appliance_firmware:9.0.0-461:*:*:*:*:*:*:* | 9.0.0-461 | Vulnerable | Cisco |
- cpe:2.3:h:cisco:email_security_appliance:8.5.6-074:*:*:*:*:*:*:* Versions 8.5.6-074 Vulnerable ·Cisco
- cpe:2.3:o:cisco:email_security_appliance_firmware:8.5.6-073:*:*:*:*:*:*:* Versions 8.5.6-073 Vulnerable ·Cisco
- cpe:2.3:o:cisco:email_security_appliance_firmware:9.0.0-461:*:*:*:*:*:*:* Versions 9.0.0-461 Vulnerable ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2015-4236
- 2026-10-03 Alias added: GHSA-gh4h-fj72-jqq3
References
More Cisco Email Security Appliance vulnerabilities
- TI-2022-05357 Cisco Email Security Appliance and Cisco Secure Email and Web Manager External Authentication Bypass Vulnerability CVSS 3.1CRITICAL 9.8
- TI-2019-01567 Cisco Email Security Appliance Denial of Service Vulnerability CVSS 3.1HIGH 8.6
- TI-2018-00378 Improper input validation in Cisco Email Security Appliance CVSS 3.0HIGH 7.5
- TI-2020-02695 Cisco Email Security Appliance Content Filter Bypass Vulnerability CVSS 3.1HIGH 7.5
- TI-2019-01541 Cisco Email Security Appliance Content Filter Bypass Vulnerability CVSS 3.0HIGH 7.5
- TI-2019-01553 Cisco Email Security Appliance Content Filter Bypass Vulnerability CVSS 3.0HIGH 7.4
Sources
- CVE-2015-4236 · CVE Program
- CVE-2015-4236 · NVD
- FIRST EPSS
- GHSA-gh4h-fj72-jqq3 · 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