CVE-2020-11721 Use after free in n/a

What is CVE-2020-11721?

CVE-2020-11721 is a medium-severity use after free vulnerability in n/a, published on 12 Apr 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

load_png in loader.c in libsixel.a in libsixel 1.8.6 has an uninitialized pointer leading to an invalid call to free, which can cause a denial of service.

Weakness: CWE-824

Which versions are affected by CVE-2020-11721?

It affects 1 product.

Products include Saitoha Libsixel.

How do I fix CVE-2020-11721?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2020-11721 being exploited?

There is no known exploitation of CVE-2020-11721 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2019-19635 Memory corruption in n/a Critical 9.8
• CVE-2019-19636 Integer overflow in n/a Critical 9.8
• CVE-2019-19637 Integer overflow in n/a Critical 9.8
• CVE-2019-19638 Integer overflow in n/a Critical 9.8
• CVE-2022-27044 Memory corruption in n/a High 8.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2020-11721, GHSA-99gh-8v88-fprw, UBUNTU-CVE-2020-11721.