CVE-2025-53645 Denial of service in n/a
Unauthenticated attackers can cause denial of service in Zimbra Collaboration by sending crafted requests with excessive path segments to the Admin Console.
- 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-2025-53645?
CVE-2025-53645 is a high-severity denial of service vulnerability in n/a, published on 9 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Zimbra Collaboration (ZCS) before 9.0.0 Patch 46, 10.0.x before 10.0.15, and 10.1.x before 10.1.9 is vulnerable to a denial of service condition due to improper handling of excessive, comma-separated path segments in the Admin Console. An unauthenticated remote attacker can send specially crafted GET requests that trigger redundant processing and inflated responses. This leads to uncontrolled resource consumption, resulting in denial of service.
Weakness: CWE-400
Which versions are affected by CVE-2025-53645?
How do I fix CVE-2025-53645?
No fix has been published for CVE-2025-53645 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-53645 being exploited?
There is no known exploitation of CVE-2025-53645 in the wild and no public exploit code.
Sources
Also known as GHSA-92rg-2wcj-32jv.