Medium severity · published Aug 10, 2021
CVE-2020-21677
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…
6.5
CVSS
0.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Libsixel · Saitoha
1.8.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-21677
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-21677
Exploit
https://github.com/saitoha/libsixel/issues/123
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