CVE-2026-76461: asyncos SQL Injection

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.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0201

Probability of exploitation

0.80%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Sep 14, 2026 Remediation due: Sep 17, 2026

Weakness Type (CWE)

CWE-89 SQL Injection

Affected Products

Vendor	Product	Versions
cisco	asyncos	< 15.5.5-014
cisco	asyncos	16.0 — 16.0.4-302
cisco	asyncos	16.5 — 16.5.0-780
cisco	secure_email_gateway_virtual_appliance_c100v	All
cisco	secure_email_gateway_virtual_appliance_c300v	All
cisco	secure_email_gateway_virtual_appliance_c600v	All
cisco	secure_email_gateway_c195	All
cisco	secure_email_gateway_c395	All
cisco	secure_email_gateway_c695	All

References

Advisories & Patches

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX

Other References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76461

Frequently Asked Questions

What is CVE-2026-76461? +

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2026-76461? +

CVE-2026-76461 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0201, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-76461? +

CVE-2026-76461 affects products from cisco, specifically: asyncos, secure_email_gateway_c195, secure_email_gateway_c395, secure_email_gateway_c695, secure_email_gateway_virtual_appliance_c100v, secure_email_gateway_virtual_appliance_c300v, secure_email_gateway_virtual_appliance_c600v. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-76461? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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