How severe is CVE-2020-35511?

CVE-2020-35511 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-35511 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35511?

CVE-2020-35511 primarily affects Libpng Pngcheck. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-35511?

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-2020-35511 published?

CVE-2020-35511 was published on 2022-08-23 and last updated on 2026-06-17.

CVE-2020-35511

CVE-2020-35511 is a high-severity vulnerability in Libpng Pngcheck with a CVSS 3.x base score of 7.8. 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-126.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-126
Affected product: Libpng Pngcheck
Published: 2022-08-23
Last modified: 2026-06-17

Description

A global buffer overflow was discovered in pngcheck function in pngcheck-2.4.0(5 patches applied) via a crafted png file.

Frequently asked questions

What is CVE-2020-35511?: A global buffer overflow was discovered in pngcheck function in pngcheck-2.4.0(5 patches applied) via a crafted png file.
How severe is CVE-2020-35511?: CVE-2020-35511 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-35511 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35511?: CVE-2020-35511 primarily affects Libpng Pngcheck. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-35511?: 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-2020-35511 published?: CVE-2020-35511 was published on 2022-08-23 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:libpng:pngcheck:2.4.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

More vulnerabilities in Libpng Pngcheck

CVE-2020-27818 — Low (CVSS 3.3): A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a malicious file to be…

All CVEs affecting Libpng Pngcheck →

Other CWE-126 (Buffer Over-read) vulnerabilities

CVE-2026-41898 — Critical (CVSS 9.8): rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.24 to before 0.10.78, the FFI…
CVE-2023-36397 — Critical (CVSS 9.8): Windows Pragmatic General Multicast (PGM) Remote Code Execution Vulnerability
CVE-2025-12106 — Critical (CVSS 9.1): Insufficient argument validation in OpenVPN 2.7_alpha1 through 2.7_rc1 allows an attacker to trigger a heap buffer…
CVE-2023-51773 — Critical (CVSS 9.1): BACnet Stack before 1.3.2 has a decode function APDU buffer over-read in bacapp_decode_application_data in bacapp.c.
CVE-2021-34584 — Critical (CVSS 9.1): Crafted web server requests can be utilised to read partial stack or heap memory or may trigger a denial-of- service…
CVE-2025-36855 — High (CVSS 8.8): A vulnerability ( CVE-2025-21176 https://www.cve.org/CVERecord ) exists in DiaSymReader.dll due to buffer over-read.…

Browse all CWE-126 (Buffer Over-read) vulnerabilities →