CVE-2020-21677 Memory corruption in n/a
Attackers can cause denial of service via heap-based buffer overflow when converting crafted PNG files to Sixel format using Libsixel.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-21677?
CVE-2020-21677 is a medium-severity memory corruption vulnerability in n/a, published on 10 Aug 2021. 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
A heap-based buffer overflow in the sixel_encoder_output_without_macro function in encoder.c of Libsixel 1.8.4 allows attackers to cause a denial of service (DOS) via converting a crafted PNG file into Sixel format.
Weakness: CWE-787
Which versions are affected by CVE-2020-21677?
It affects 1 product.
Products include Saitoha Libsixel.
How do I fix CVE-2020-21677?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-21677 being exploited?
There is no known exploitation of CVE-2020-21677 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2020-21677, GHSA-j9fq-4p85-2pqh, UBUNTU-CVE-2020-21677.