Libsixel
CVE-2020-36120
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
1DescriptionCVE.org
Buffer Overflow in the "sixel_encoder_encode_bytes" function of Libsixel v1.8.6 allows attackers to cause a Denial of Service (DoS).
AnalysisAI
Buffer Overflow in the "sixel_encoder_encode_bytes" function of Libsixel v1.8.6 allows attackers to cause a Denial of Service (DoS). Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
Technical ContextAI
This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. Buffer Overflow in the "sixel_encoder_encode_bytes" function of Libsixel v1.8.6 allows attackers to cause a Denial of Service (DoS). Affected products include: Saitoha Libsixel.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.
An issue was discovered in libsixel 1.8.4. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, n
An issue was discovered in libsixel 1.8.4. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, n
libsixel 1.8.4 has an integer overflow in sixel_frame_resize in frame.c. Rated high severity (CVSS 8.8), this vulnerabil
libsixel 1.10.0 is vulnerable to Use after free in libsixel/src/dither.c:379. Rated high severity (CVSS 8.8), this vulne
Libsixel 1.8.3 contains a heap-based buffer overflow in the sixel_encode_highcolor function in tosixel.c. Rated high sev
Libsixel 1.8.2 contains a heap-based buffer overflow in the dither_func_fs function in tosixel.c. Rated high severity (C
An issue was discovered in libsixel 1.8.2. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, n
stb_image.h (aka the stb image loader) 2.23, as used in libsixel and other products, has a heap-based buffer over-read i
libsixel before 1.10 is vulnerable to Buffer Overflow in libsixel/src/quant.c:867. Rated high severity (CVSS 8.8), this
libsixel 1.8.6 is affected by Buffer Overflow in libsixel/src/quant.c:876. Rated high severity (CVSS 8.8), this vulnerab
libsixel 1.8.6 suffers from a Heap Use After Free vulnerability in in libsixel/src/dither.c:388. Rated high severity (CV
In libsixel v1.8.2, there is a heap-based buffer over-read in the function load_jpeg() in the file loader.c, as demonstr
Same weakness CWE-120 – Classic Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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