CVE-2026-76461
Exploitation confirmed. First attested on 2026-09-14 by CISA-ADP, CISA KEV, GCVE · previdian.
- Published2026-09-14
- Fixed in16.5.0-780 · 16.0.4-302 · 15.5.5-014
- WeaknessCWE-89
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
A vulnerability in the email parsing of Cisco AsyncOS Software for Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to execute arbitrary commands with root privileges on the underlying operating system. This vulnerability is due to insufficient validation in the email parsing logic. An attacker could exploit this vulnerability by sending a crafted email message that contains malicious SQL statements through an affected device. A successful exploit could allow the attacker to execute arbitrary SQL statements, leading to command execution with root privileges on the underlying operating system.
Timeline
dates in UTCObserved activity
isMalicious corpus · updated 2026-10-30 03:37 UTC| Indicator | Role | Seen | Source |
|---|---|---|---|
| 87.120.219.207 | payload delivery | 3 h ago | ThreatHive - Hive Blocklist, Community IOC feed, T145 - Black Mirror IPv4 Blocklist, Bitwire - Inbound Blocklist, FFraud - Confirmed abusive IPs, Rösti - MISP OSINT Feed, Romain Marcoux - Malicious Outgoing IPs, Threatview IP Blocklist, Malware-Filter - Botnet Filter IPs, Malware-Filter - Botnet Filter, Bitwire - Outbound Blocklist |
Block these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-76461?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-76461?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 16.5 | ≥ 16.5, < 16.5.0-780 | 16.5.0-780 | NVD |
| 16.0 | ≥ 16.0, < 16.0.4-302 | 16.0.4-302 | NVD |
| 15.5 | < 15.5.5-014 | 15.5.5-014 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Cisco asyncos to 16.5.0-780 · 16.0.4-302 · 15.5.5-014
- CISA’s 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.due 2026-09-17
Advisories and patches
- sec.cloudapps.cisco.comVendor Advisory
Detection
read 2026-10-30 00:46 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 4 repositories, unverifiedHORKimhab/CVE-2026-764610xredash/CVE-2026-76461fevar54/CVE-2026-76461-Detection-Kit-S3v3n-JG/CVE-2026-76461 PoC-in-GitHub
CISA Known Exploited Vulnerability
- Date Added
- 2026-09-14
- Patch Due Date
- 2026-09-17
- 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.
Sources
- NVDCVE recordread 2026-10-23
- CISA KEVKEV entry2026-09-14
- GCVEexploitation2026-09-14
- CISA-ADPSSVC decisionactive2026-09-14
- OpenCVESSVC decisionactive—
- CNACVSS 3.19.8read 2026-10-23
- CNAweakness (CWE)CWE-89read 2026-10-23
- FIRST EPSSEPSS score29.5 %read 2026-10-30
- PoC-in-GitHubproof of concept4read 2026-10-30
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2026-09-14
- Last Modified
- 2026-09-15
- NVD status
- Analyzed
Frequently asked questions
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.