CVE-2025-20153 Cisco ESA mail Bypass
Unauthenticated attackers can bypass email filtering rules on Cisco Secure Email Gateway by sending crafted emails, allowing denied messages to pass through.
- 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-2025-20153?
CVE-2025-20153 is a medium-severity vulnerability in Cisco Secure Email, published on 19 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the email filtering mechanism of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to bypass the configured rules and allow emails that should have been denied to flow through an affected device. This vulnerability is due to improper handling of email that passes through an affected device. An attacker could exploit this vulnerability by sending a crafted email through the affected device. A successful exploit could allow the attacker to bypass email filters on the affected device.
Weakness: CWE-284
Which versions are affected by CVE-2025-20153?
It affects 1 product.
Products include Cisco Secure Email Gateway.
How do I fix CVE-2025-20153?
No fix has been published for CVE-2025-20153 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-20153 being exploited?
There is no known exploitation of CVE-2025-20153 in the wild and no public exploit code.
Other vulnerabilities in Cisco Secure Email
Sources
Also known as GHSA-9ppw-7p8w-h9g2.