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MEDIUM

CVE-2020-24977

CVSS v3

6.5

MEDIUM

EPSS Score

3.0 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2020-24977 Red Hat Product Security45 products fixed · 11 known affected

    libxml2: Buffer overflow vulnerability in xmlEncodeEntitiesInternal() in entities.c

    libxml2.src as a component of Red Hat Enterprise Linux 5 · libxml2 as a component of Red Hat Enterprise Linux 6 · libxml2-devel as a component of Red Hat Enterprise Linux 6

  • ICSA-23-348-10 CISA5 known affected

    Siemens SIMATIC S7-1500

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)

  • SSA-398330 Siemens ProductCERT5 known affected

    SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.0 < V3.1.5

  • ICSA-21-336-06 CISA3 known affected

    Hitachi Energy APM Edge

    APM Edge: Version 3.0 · APM Edge: Version 2.0 · APM Edge: Version 1.0

  • ICSA-21-336-08 CISA9 known affected

    Hitachi Energy RTU500 series

    RTU500 series CMU Firmware: Version 12.2.* · RTU500 series CMU Firmware: Version 13.1.* · RTU500 series CMU Firmware: Version 13.0.*

  • RHSA-2021:1597 Red Hat Product Security45 products fixed

    Red Hat Security Advisory: libxml2 security update

Full record on NVD

Description

GNOME project libxml2 v2.9.10 has a global buffer over-read vulnerability in xmlEncodeEntitiesInternal at libxml2/entities.c. The issue has been fixed in commit 50f06b3e.

Technical details

Published
2020-09-04

Frequently asked questions

What is CVE-2020-24977?

GNOME project libxml2 v2.9.10 has a global buffer over-read vulnerability in xmlEncodeEntitiesInternal at libxml2/entities.c. The issue has been fixed in commit 50f06b3e.

Is CVE-2020-24977 actively exploited?

Active exploitation of CVE-2020-24977 has not been confirmed. Its EPSS score was 3.0% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-24977?

CVE-2020-24977 has a CVSS v3 base score of 6.5 (MEDIUM severity).

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