CVE-2020-24977

CVE-2020-24977 is a medium-severity vulnerability in Xmlsoft Libxml2 with a CVSS 3.x base score of 6.5. 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-125.

Key facts

• Severity: Medium (CVSS 3.x base score 6.5)
• CVSS v2: 6.4
• EPSS exploit prediction: 4% (88th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-125
• Affected product: Xmlsoft Libxml2
• Published: 2020-09-04
• Last modified: 2026-06-17

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.

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.

How severe is CVE-2020-24977?

CVE-2020-24977 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2020-24977 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-24977?

CVE-2020-24977 primarily affects Xmlsoft Libxml2. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-24977?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-24977 published?

CVE-2020-24977 was published on 2020-09-04 and last updated on 2026-06-17.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00036.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00061.html
• https://gitlab.gnome.org/GNOME/libxml2/-/commit/50f06b3efb638efb0abd95dc62dca05ae67882c2
• https://gitlab.gnome.org/GNOME/libxml2/-/issues/178
• https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
• https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2NQ5GTDYOVH26PBCPYXXMGW5ZZXWMGZC/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5KTUAGDLEHTH6HU66HBFAFTSQ3OKRAN3/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/674LQPJO2P2XTBTREFR5LOZMBTZ4PZAY/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7KQXOHIE3MNY3VQXEN7LDQUJNIHOVHAW/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ENEHQIBMSI6TZVS35Y6I4FCTYUQDLJVP/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H3IQ7OQXBKWD3YP7HO6KCNOMLE5ZO2IR/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J3ICASXZI2UQYFJAOQWHSTNWGED3VXOE/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JCHXIWR5DHYO3RSO7RAHEC6VJKXD2EH2/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O7MEWYKIKMV2SKMGH4IDWVU3ZGJXBCPQ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RIQAMBA2IJUTQG5VOP5LZVIZRNCKXHEQ/
• https://security.gentoo.org/glsa/202107-05
• https://security.netapp.com/advisory/ntap-20200924-0001/
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://www.oracle.com/security-alerts/cpuoct2021.html

Affected products (26)

• cpe:2.3:a:xmlsoft:libxml2:2.9.10:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:active_iq_unified_manager:*:*:*:*:*:windows:*:*
• cpe:2.3:a:netapp:active_iq_unified_manager:*:*:*:*:*:vmware_vsphere:*:*
• cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:clustered_data_ontap_antivirus_connector:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:inventory_collect_tool:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:manageability_software_development_kit:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:snapdrive:-:*:*:*:*:unix:*:*
• cpe:2.3:a:netapp:snapdrive:-:*:*:*:*:windows:*:*
• cpe:2.3:o:netapp:hci_h410c_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_base_platform:13.4.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_base_platform:13.5.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:mysql_workbench:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:real_user_experience_insight:13.4.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:real_user_experience_insight:13.5.1.0:*:*:*:*:*:*:*

More vulnerabilities in Xmlsoft Libxml2

• CVE-2008-3529 — Critical (CVSS 10.0): Heap-based buffer overflow in the xmlParseAttValueComplex function in parser.c in libxml2 before 2.7.0 allows…
• CVE-2004-0989 — Critical (CVSS 10.0): Multiple buffer overflows in libXML 2.6.12 and 2.6.13 (libxml2), and possibly other versions, may allow remote…
• CVE-2017-7376 — Critical (CVSS 9.8): Buffer overflow in libxml2 allows remote attackers to execute arbitrary code by leveraging an incorrect limit for port…
• CVE-2017-7375 — Critical (CVSS 9.8): A flaw in libxml2 allows remote XML entity inclusion with default parser flags (i.e., when the caller did not request…
• CVE-2017-16931 — Critical (CVSS 9.8): parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the…
• CVE-2016-4658 — Critical (CVSS 9.8): xpointer.c in libxml2 before 2.9.5 (as used in Apple iOS before 10, OS X before 10.12, tvOS before 10, and watchOS…

All CVEs affecting Xmlsoft Libxml2 →

Other CWE-125 (Out-of-bounds Read) vulnerabilities

• CVE-2026-24826 — Critical (CVSS 10.0): Out-of-bounds Write, Divide By Zero, NULL Pointer Dereference, Use of Uninitialized Resource, Out-of-bounds Read,…
• CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
• CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
• CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
• CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
• CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

Browse all CWE-125 (Out-of-bounds Read) vulnerabilities →