CVE & CISA-KEV Catalog

CVE-2021-31347

MEDIUM
6.5
CVSS v3
NVD

Description

An issue was discovered in libezxml.a in ezXML 0.8.6. The function ezxml_parse_str() performs incorrect memory handling while parsing crafted XML files (writing outside a memory region created by mmap).

CWE-91

How to fix

Remediation Available
scilabUbuntu
Fixed in:5.5.2-2ubuntu3+esm1USN-5061-1

This Ubuntu release reached end-of-life on 2021-04-02.

scilab-dataUbuntu
Fixed in:5.5.2-2ubuntu3+esm1USN-5061-1

This Ubuntu release reached end-of-life on 2021-04-02.

scilab-full-binUbuntu
Fixed in:5.5.2-2ubuntu3+esm1USN-5061-1

This Ubuntu release reached end-of-life on 2021-04-02.

scilab-minimal-binUbuntu
Fixed in:5.5.2-2ubuntu3+esm1USN-5061-1

This Ubuntu release reached end-of-life on 2021-04-02.

scilab-testUbuntu
Fixed in:5.5.2-2ubuntu3+esm1USN-5061-1

This Ubuntu release reached end-of-life on 2021-04-02.

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

1.11%probability of exploitation in 30 days
64thpercentile

Moderate risk: more likely to be exploited than 64% of all known CVEs.

References

Third-Party Advisory1

Related Vulnerabilities

Other CWE-91 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2020-0646Critical9.899%KEV-
CVE-2023-27253High8.890%--
CVE-2023-46214High8.089%-Fix
CVE-2024-53675High7.384%-Fix
CVE-2024-53674High7.347%-Fix
CVE-2023-43187Critical9.845%-Fix

Common questions

How do I fix CVE-2021-31347?

Published advisories record a fix for 5 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2021-31347 being actively exploited?

Not that we know of. CVE-2021-31347 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.1% is the estimated probability that it will be exploited in the next 30 days. That is higher than 64% of all scored CVEs.

How severe is CVE-2021-31347?

CVE-2021-31347 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-31347 affect?

Published advisories record a fix for scilab (Ubuntu), scilab-data (Ubuntu), scilab-full-bin (Ubuntu), scilab-minimal-bin (Ubuntu), and 1 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.