CVE-2021-28994 Denial of service in n/a

High 7.5 Published 31 Mar 2021 Updated 3 Aug 2024

Attackers can cause memory exhaustion and service disruption in Kopano Groupware Core by sending long HTTP headers.

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-2021-28994?

CVE-2021-28994 is a high-severity denial of service vulnerability in n/a, published on 31 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

kopano-ical (formerly zarafa-ical) in Kopano Groupware Core through 8.7.16, 9.x through 9.1.0, 10.x through 10.0.7, and 11.x through 11.0.1 and Zarafa 6.30.x through 7.2.x allows memory exhaustion via long HTTP headers.

Weakness: CWE-770

Which versions are affected by CVE-2021-28994?

It affects 2 products.

Products include Kopano Groupware Core, Zarafa Zarafa.

How do I fix CVE-2021-28994?

No fix has been published for CVE-2021-28994 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-2021-28994 being exploited?

There is no known exploitation of CVE-2021-28994 in the wild and no public exploit code.

Sources

Also known as GHSA-796m-wc5q-p6qj, UBUNTU-CVE-2021-28994.