Cisco Secure Email Gateway Arbitrary File Write Vulnerability
Affects Cisco Secure Email with File Reputation (part of Cisco AMP) enabled and assigned to a mail policy, and Content Scanner Tools earlier than 25.3.0.5525. The checked facts name no fixed release.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: active
- Automatable: yes
- Technical impact: total
Summary
Cisco Secure Email Gateway's Advanced Malware Protection feature is affected. An unauthenticated remote attacker who sends an email with a specially crafted attachment could write arbitrary files to the underlying operating system and potentially run commands with root privileges.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
A 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.
Timeline
- CISA SSVC assessment
Exploitation: active · Automatable: yes · Technical impact: total
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CVE published
- Record last updated
- CISA remediation deadline
Due date for US federal agencies to patch
Affected versions
- Cisco Cisco Secure Email
14.0.0-698, 13.5.1-277, 13.0.0-392, 14.2.0-620, 13.0.5-007, 13.5.4-038, 14.2.1-020, 14.3.0-032, 15.0.0-104, 15.0.1-030, 15.5.0-048, 15.5.1-055, 15.5.2-018, 16.0.0-050, 15.0.3-002, 16.0.0-054, 15.5.3-022, 16.0.1-017, 15.5.4-012, 16.0.4-016, 15.0.5-016, 16.0.2-112, 16.0.3-044
References 1
sec.cloudapps.cisco.com
Questions about CVE-2026-76519
What does this mean?
A flaw lets an attacker write arbitrary files and run commands with root privileges on the underlying operating system of the affected Cisco Secure Email device. CVSS rates it 9.8, critical.Source: sec.cloudapps.cisco.com
Am I affected, and how do I check?
The exposure needs three things: File Reputation (part of Cisco AMP) enabled and assigned to a mail policy, Content Scanner Tools earlier than 25.3.0.5525, and a vulnerable release of Cisco AsyncOS Software. To check, look at the Content Scanner Tools version and the File Reputation settings for mail policies on the appliance.Source: sec.cloudapps.cisco.com
What should I do about it?
The checked facts do not name a fixed release. Compare the Content Scanner Tools version with 25.3.0.5525 and check Cisco's advisory for the fixed AsyncOS and Content Scanner Tools versions.Source: sec.cloudapps.cisco.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-10-14, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data
What if there's no patch?
The checked facts name no workaround. The exposure requires File Reputation to be enabled and assigned to a mail policy, so review that setting while waiting for a fix, and follow Cisco's advisory.Source: sec.cloudapps.cisco.com