Buffer Overflow in the "sixel_encoder_encode_bytes" function of Libsixel v1.8.6 allows attackers to cause a Denial of Service (DoS).
CVE-2020-36120
HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EG Risk
- 39(Track)EG Risk 39/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity75% × 45%Exploitation1% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 68%
- KEV
- Not listed
Published
April 14, 2021
Last Modified
April 24, 2026
References (2)
- cve@mitrehttps://github.com/saitoha/libsixel/issues/143
- af854a3a-2127-422b-91ae-364da2661108https://github.com/saitoha/libsixel/issues/143
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Frequently asked(5)
What is CVE-2020-36120?
CVE-2020-36120 is a high vulnerability published on April 14, 2021. Buffer Overflow in the "sixelencoderencode_bytes" function of Libsixel v1.8.6 allows attackers to cause a Denial of Service (DoS).
When was CVE-2020-36120 disclosed?
CVE-2020-36120 was first published in the National Vulnerability Database on April 14, 2021, with the most recent update on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-36120 actively exploited?
CVE-2020-36120 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 32.2% of all scored CVEs.
What is the CVSS score of CVE-2020-36120?
CVE-2020-36120 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2020-36120?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-36120, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2020-36120
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