CVE-2020-26082 Security feature bypass in Cisco Secure Email
Unauthenticated attackers can bypass content filters on Cisco Email Security Appliances by sending malicious files in password-protected zip archives.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-26082?
CVE-2020-26082 is a medium-severity vulnerability in Cisco Asyncos, published on 4 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the zip decompression engine of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass content filters that are configured on an affected device. The vulnerability is due to improper handling of password-protected zip files. An attacker could exploit this vulnerability by sending a malicious file inside a crafted zip-compressed file to an affected device. A successful exploit could allow the attacker to bypass configured content filters that would normally drop the email.
Weakness: CWE-20
Which versions are affected by CVE-2020-26082?
It affects 1 product.
Products include Cisco Asyncos.
How do I fix CVE-2020-26082?
No fix has been published for CVE-2020-26082 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-26082 being exploited?
There is no known exploitation of CVE-2020-26082 in the wild and no public exploit code.
Other vulnerabilities in Cisco Asyncos
- CVE-2025-20393 Cisco Multiple Products Improper Input Validation
- CVE-2026-76519 Cisco Secure Email Gateway Relative Path Traversal
- CVE-2026-76461 Cisco Secure Email Gateway SQL Injection
- CVE-2024-20435 Command injection in Cisco Secure Web Appliance
- CVE-2019-15956 Cisco Web Security Appliance Unauthorized Device Reset Vulnerability
Sources
Also known as GHSA-3hxf-p384-rmc6.