CVE-2026-76519
Critical9.8CISA KEV — exploited in the wildA vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system. This vulnerability is due to improper handling of email attachments when the file reputation service is enabled. An attacker could exploit this vulnerability by sending an email that contains a crafted attachment through an affected device. A successful exploit could allow the attacker to write arbitrary files and execute commands with root privileges on the underlying operating system.
- CVSS
- 9.8v3.1
- EPSS (exploit probability)
- 1.6%75th pct
- CISA KEV
- Listed
EPSS trendFIRST daily scores, last 90 days
Daily values
| Score date | EPSS | Percentile |
|---|---|---|
| 2026-10-20 | 1.6% | 75.1% |
| 2026-10-19 | 1.6% | 75.0% |
| 2026-10-18 | 1.6% | 75.0% |
| 2026-10-16 | 1.6% | 75.0% |
| 2026-10-15 | 1.7% | 77.4% |
CISA KEV entrycatalogue 2026.10.20
- Date added
- 2026-10-14
- Federal due date
- 2026-10-17
- Known ransomware use
- Unknown
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Verbatim from the CISA KEV catalogue (CISA KEV, fetched 2026-10-21 07:34 UTC). The due date applies to US federal agencies under BOD 22-01.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
- cisco asyncos
- cisco secure email gateway virtual appliance c100v
- cisco secure email gateway virtual appliance c300v
- cisco secure email gateway virtual appliance c600v
- cisco secure email gateway c195
- cisco secure email gateway c395
- cisco secure email gateway c695