CVE catalog
CVE-2020-21677
libsixel: CVE-2020-21677
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.90% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libsixel | sid | 1:1.8.7-r2-1 | fixed |
| Debian | libsixel | forky | 1:1.8.7-r2-1 | fixed |
| Debian | libsixel | trixie | 1.10.5-1 | fixed |
| Debian | libsixel | bookworm | 1.10.3-3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libsixel | source | sid | 1.8.6-1 | not yet assigned | Not reported | Not reported |
| Debian | libsixel | source | forky | 1.8.6-1 | not yet assigned | Not reported | Not reported |
| Debian | libsixel | source | trixie | 1.8.6-1 | not yet assigned | Not reported | Not reported |
| Debian | libsixel | source | bookworm | 1.8.6-1 | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libsixel1]Fixed
Source package: [libsixel]
Details (2)
1.10.3-3· amd64 · bookwormFixed · Fixed:
1.8.6-1dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
1.10.3-3· arm64 · bookwormFixed · Fixed:
1.8.6-1dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
- [libsixel-bin]Fixed
Source package: [libsixel]
Details (2)
1.10.3-3· amd64 · bookwormFixed · Fixed:
1.8.6-1dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
1.10.3-3· arm64 · bookwormFixed · Fixed:
1.8.6-1dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
- [libsixel-dev]Fixed
Source package: [libsixel]
Details (2)
1.10.3-3· amd64 · bookwormFixed · Fixed:
1.8.6-1dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
1.10.3-3· arm64 · bookwormFixed · Fixed:
1.8.6-1dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
- [libsixel-examples]Fixed
Source package: [libsixel]
Details (2)
1.10.3-3· all · bookwormFixed · Fixed:
1.8.6-1dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
1.10.3-3· all · bookwormFixed · Fixed:
1.8.6-1dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
[Debian 13 (Trixie)]
- [libsixel1]Fixed
Source package: [libsixel]
Details (2)
1.10.5-1· amd64 · trixieFixed · Fixed:
1.8.6-1dsa · libsixel · debian · 13
1.10.5-1· arm64 · trixieFixed · Fixed:
1.8.6-1dsa · libsixel · debian · 13
- [libsixel-bin]Fixed
Source package: [libsixel]
Details (2)
1.10.5-1· amd64 · trixieFixed · Fixed:
1.8.6-1dsa · libsixel · debian · 13
1.10.5-1· arm64 · trixieFixed · Fixed:
1.8.6-1dsa · libsixel · debian · 13
- [libsixel-dev]Fixed
Source package: [libsixel]
Details (2)
1.10.5-1· amd64 · trixieFixed · Fixed:
1.8.6-1dsa · libsixel · debian · 13
1.10.5-1· arm64 · trixieFixed · Fixed:
1.8.6-1dsa · libsixel · debian · 13
- [libsixel-examples]Fixed
Source package: [libsixel]
Details (2)
1.10.5-1· all · trixieFixed · Fixed:
1.8.6-1dsa · libsixel · debian · 13
1.10.5-1· all · trixieFixed · Fixed:
1.8.6-1dsa · libsixel · debian · 13
Observed: