CVE-2021-28040 Denial of service in n/a
An attacker can cause a segmentation fault and crash the OSSEC service by sending XML data with excessive nested tags, leading to denial of service.
- 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-2021-28040?
CVE-2021-28040 is a high-severity denial of service vulnerability in n/a, published on 5 Mar 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 OSSEC 3.6.0. An uncontrolled recursion vulnerability in os_xml.c occurs when a large number of opening and closing XML tags is used. Because recursion is used in _ReadElem without restriction, an attacker can trigger a segmentation fault once unmapped memory is reached.
Weakness: CWE-674
Which versions are affected by CVE-2021-28040?
It affects 1 product.
Products include Ossec Ossec.
How do I fix CVE-2021-28040?
No fix has been published for CVE-2021-28040 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-2021-28040 being exploited?
There is no known exploitation of CVE-2021-28040 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-87rm-8q5w-499g.