CVE-2021-28651 Denial of service in n/a
A buffer-management bug in Squid allows attackers to trigger excessive memory consumption via urn: scheme requests, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-28651?
CVE-2021-28651 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 27 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of memory consumption.
Weakness: CWE-401
Which versions are affected by CVE-2021-28651?
It affects 4 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Netapp Cloud Manager, Squid-Cache Squid.
How do I fix CVE-2021-28651?
Upgrade to a fixed version.
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-2021-28651 being exploited?
There is no known exploitation of CVE-2021-28651 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2021-28651, CLSA-2021-1634925537, CLSA-2021-1635459285, CLSA-2022-1650575956, DEBIAN-CVE-2021-28651, GHSA-ch36-9jhx-phm4 and 1 more.