CVE-2021-31598

An issue was discovered in libezxml.a in ezXML 0.8.6. The function ezxml_decode() performs incorrect memory handling while parsing crafted XML files, leading to a heap-based buffer overflow.

Published: 2021-04-24 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-31598 is rated Moderate Risk (56.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.86%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-31598

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-13 0.83% 0.86% +0.03%
2 2025-11-21 0.49% 0.83% +0.34%
3 2025-11-18 — 0.49% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-31598

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-31598

OS Trackers for CVE-2021-31598

vendor priority summary link
debian unimportant CVE-2021-31598 unimportant priority: Debian including 4 source packages (mapcache, netcdf, netcdf-parallel, scilab), 20 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 10, resolved 10. https://security-tracker.debian.org/tracker/CVE-2021-31598
suse medium CVE-2021-31598 severity moderate: SUSE including 249 source package names (libnetcdf-gnu-hpc, libnetcdf-gnu-hpc-4.6.1-10.7.2, …), 642 product×package rows across 25 product lines (SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS, SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS, … (25 product lines)): Fixed 575, Known Not Affected 67. https://www.suse.com/security/cve/CVE-2021-31598/
ubuntu low CVE-2021-31598 low priority: Ubuntu including 4 source packages (mapcache, netcdf, netcdf-parallel, scilab), 64 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 35, needed 14, not-affected 7, DNE 4, released 3, needs-triage 1. https://ubuntu.com/security/CVE-2021-31598

Affected software / configurations for CVE-2021-31598

Vendor Product Version Raw CPE
ezxml_project ezxml 0.8.6 cpe:2.3:a:ezxml_project:ezxml:0.8.6:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

References for CVE-2021-31598

URL Tags
https://lists.debian.org/debian-lts-announce/2021/07/msg00005.html Mailing List Third Party Advisory
https://sourceforge.net/p/ezxml/bugs/28/ Issue Tracking Patch Third Party Advisory
cvelogic Threat Intelligence