Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2025-6021

Out-of-bounds Write

Published: Jun 12, 2025 | Modified: May 12, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 MODERATE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2025-6021
CWEhttps://cwe.mitre.org/data/definitions/787.html

A flaw was found in libxml2s xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.

Weakness

The product writes data past the end, or before the beginning, of the intended buffer.

Affected Software

NameVendorStart VersionEnd Version
Libxml2Xmlsoft*2.14.4 (excluding)
Red Hat Enterprise Linux 10RedHatlibxml2-0:2.12.5-7.el10_0*
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRedHatlibxml2-0:2.9.1-6.el7_9.10*
Red Hat Enterprise Linux 8RedHatlibxml2-0:2.9.7-21.el8_10.1*
Red Hat Enterprise Linux 8RedHatlibxml2-0:2.9.7-21.el8_10.1*
Red Hat Enterprise Linux 8.2 Advanced Update SupportRedHatlibxml2-0:2.9.7-9.el8_2.3*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatlibxml2-0:2.9.7-9.el8_4.6*
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRedHatlibxml2-0:2.9.7-9.el8_4.6*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatlibxml2-0:2.9.7-13.el8_6.10*
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRedHatlibxml2-0:2.9.7-13.el8_6.10*
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRedHatlibxml2-0:2.9.7-13.el8_6.10*
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRedHatlibxml2-0:2.9.7-16.el8_8.9*
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRedHatlibxml2-0:2.9.7-16.el8_8.9*
Red Hat Enterprise Linux 9RedHatlibxml2-0:2.9.13-10.el9_6*
Red Hat Enterprise Linux 9RedHatlibxml2-0:2.9.13-10.el9_6*
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRedHatlibxml2-0:2.9.13-1.el9_0.5*
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRedHatlibxml2-0:2.9.13-3.el9_2.7*
Red Hat Enterprise Linux 9.4 Extended Update SupportRedHatlibxml2-0:2.9.13-10.el9_4*
Red Hat JBoss Core Services 2.4.62.SP2RedHatlibxml2*
Red Hat OpenShift Container Platform 4.12RedHatrhcos-412.86.202509030110-0*
Red Hat OpenShift Container Platform 4.13RedHatrhcos-413.92.202509030117-0*
Red Hat OpenShift Container Platform 4.14RedHatrhcos-414.92.202508041909-0*
Red Hat OpenShift Container Platform 4.15RedHatrhcos-415.92.202508192014-0*
Red Hat OpenShift Container Platform 4.16RedHatrhcos-416.94.202508050040-0*
Red Hat OpenShift Container Platform 4.17RedHatrhcos-417.94.202508141510-0*
Red Hat OpenShift Container Platform 4.18RedHatrhcos-418.94.202508060022-0*
Red Hat OpenShift Container Platform 4.19RedHatrhcos-4.19.9.6.202507230107-0*
Red Hat Discovery 2RedHatdiscovery/discovery-server-rhel9:2.0.1-1754478727*
Red Hat Hardened ImagesRedHatlibxml2-main-2.15.2-0.3.hum1*
Red Hat Insights proxy 1.5RedHatinsights-proxy/insights-proxy-container-rhel9:1.5.5-1754504343*
Libxml2Ubuntuesm-infra-legacy/trusty*
Libxml2Ubuntuesm-infra-legacy/xenial*
Libxml2Ubuntuesm-infra/bionic*
Libxml2Ubuntuesm-infra/focal*
Libxml2Ubuntuesm-infra/xenial*
Libxml2Ubuntujammy*
Libxml2Ubuntunoble*
Libxml2Ubuntuoracular*
Libxml2Ubuntuplucky*
Libxml2Ubuntuupstream*

Potential Mitigations

  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.

  • For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer.

  • Be wary that a language’s interface to native code may still be subject to overflows, even if the language itself is theoretically safe.

  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.

  • Examples include the Safe C String Library (SafeStr) by Messier and Viega [REF-57], and the Strsafe.h library from Microsoft [REF-56]. These libraries provide safer versions of overflow-prone string-handling functions.

  • Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking.

  • D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses canary-based detection in detail.

  • Consider adhering to the following rules when allocating and managing an application’s memory:

  • Run or compile the software using features or extensions that randomly arrange the positions of a program’s executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code.

  • Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported modules may be similarly realigned if their default memory addresses conflict with other modules, in a process known as “rebasing” (for Windows) and “prelinking” (for Linux) [REF-1332] using randomly generated addresses. ASLR for libraries cannot be used in conjunction with prelink since it would require relocating the libraries at run-time, defeating the whole purpose of prelinking.

  • For more information on these techniques see D3-SAOR (Segment Address Offset Randomization) from D3FEND [REF-1335].

  • Use a CPU and operating system that offers Data Execution Protection (using hardware NX or XD bits) or the equivalent techniques that simulate this feature in software, such as PaX [REF-60] [REF-61]. These techniques ensure that any instruction executed is exclusively at a memory address that is part of the code segment.

  • For more information on these techniques see D3-PSEP (Process Segment Execution Prevention) from D3FEND [REF-1336].

References

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