CISCO Security Advisory
Published Date: Not specified
CVE: CVE-2026-76461
Advisory Summary
🟥 📣 Security Update: Cisco Secure Email Gateway SQL Injection (Critical)
⚠️ What happened
Cisco AsyncOS (Cisco Secure Email Gateway) has a critical vulnerability in its email parsing. A remote attacker can send a crafted email that triggers SQL injection, which may result in arbitrary command execution with root privileges on the underlying OS.
- Unauthenticated remote access: No login required to attempt exploitation.
- Root-level impact: Successful exploitation can fully compromise the device.
- Direct path via inbound email: Attackers can leverage normal mail-flow to reach the vulnerable parsing logic.
- Root cause: Insufficient validation in email parsing.
- Exploit idea: Inject malicious SQL via a crafted email message.
- Outcome: Arbitrary SQL → command execution as root.
- ✅ Cisco released software updates addressing the issue.
- 🚫 No workarounds are provided for this vulnerability—patching is the primary action.
🔒 Action checklist (recommended immediately)
1. Identify affected AsyncOS/Cisco Secure Email Gateway versions in your environment.
2. Apply the released Cisco updates as soon as possible, prioritizing edge devices handling internet-facing mail.
3. Temporarily tighten mail-flow exposure (where feasible) by restricting inbound sources and enforcing stricter email policies while patching.
4. Monitor logs for suspicious parsing/DB/query-related activity around inbound messages.
5. Validate device integrity post-update (configuration + operational health checks).
- CVE: CVE-2026-76461
- Severity: Critical
- Attack surface: email parsing on Cisco Secure Email Gateway
📌
🔗 https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX
-2026-76461
Reference: Vendor Advisory