CVE-2021-21827 Memory corruption in AT&T
A heap-based buffer overflow in Xmill allows attackers to execute arbitrary code or cause denial of service via a malicious XMI file.
- 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-2021-21827?
CVE-2021-21827 is a high-severity memory corruption vulnerability in AT&T, published on 20 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT&T Labs Xmill 0.7. Within `DecodeTreeBlock` which is called during the decompression of an XMI file, a UINT32 is loaded from the file and used as trusted input as the length of a buffer. An attacker can provide a malicious file to trigger this vulnerability.
Which versions are affected by CVE-2021-21827?
It affects 1 product.
Products include Att Xmill.
How do I fix CVE-2021-21827?
No fix has been published for CVE-2021-21827 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-21827 being exploited?
There is no known exploitation of CVE-2021-21827 in the wild and no public exploit code.
Other vulnerabilities in AT&T
Sources
Also known as GHSA-q52q-979x-2v5q.