How severe is CVE-2020-36277?

CVE-2020-36277 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-36277 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-36277?

CVE-2020-36277 primarily affects Leptonica. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-36277?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-36277 published?

CVE-2020-36277 was published on 2021-03-11 and last updated on 2026-06-17.

CVE-2020-36277

CVE-2020-36277 is a high-severity vulnerability in Leptonica with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-670.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-670
Affected product: Leptonica
Published: 2021-03-11
Last modified: 2026-06-17

Description

Leptonica before 1.80.0 allows a denial of service (application crash) via an incorrect left shift in pixConvert2To8 in pixconv.c.

Frequently asked questions

What is CVE-2020-36277?: Leptonica before 1.80.0 allows a denial of service (application crash) via an incorrect left shift in pixConvert2To8 in pixconv.c.
How severe is CVE-2020-36277?: CVE-2020-36277 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-36277 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-36277?: CVE-2020-36277 primarily affects Leptonica. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-36277?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-36277 published?: CVE-2020-36277 was published on 2021-03-11 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:leptonica:leptonica:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

More vulnerabilities in Leptonica

CVE-2018-7440 — Critical (CVSS 9.8): An issue was discovered in Leptonica through 1.75.3. The gplotMakeOutput function allows command injection via a…
CVE-2018-7247 — Critical (CVSS 9.8): An issue was discovered in pixHtmlViewer in prog/htmlviewer.c in Leptonica before 1.75.3. Unsanitized input (rootname)…
CVE-2018-7186 — Critical (CVSS 9.8): Leptonica before 1.75.3 does not limit the number of characters in a %s format argument to fscanf or sscanf, which…
CVE-2018-7442 — Critical (CVSS 9.1): An issue was discovered in Leptonica through 1.75.3. The gplotMakeOutput function does not block '/' characters in the…
CVE-2018-3836 — High (CVSS 7.8): An exploitable command injection vulnerability exists in the gplotMakeOutput function of Leptonica 1.74.4. A specially…
CVE-2020-36281 — High (CVSS 7.5): Leptonica before 1.80.0 allows a heap-based buffer over-read in pixFewColorsOctcubeQuantMixed in colorquant1.c.

All CVEs affecting Leptonica →

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