VDB-193191 · CVE-2022-25235 · Nessus 236603

libexpat up to 2.4.4 UTF-8 Character xmltok_impl.c encoding error

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3	$0-$5k	0.00

Summaryinfo

A vulnerability was found in libexpat up to 2.4.4. It has been classified as problematic. This impacts an unknown function of the file xmltok_impl.c of the component UTF-8 Character Handler. Performing a manipulation results in encoding error. This vulnerability is identified as CVE-2022-25235. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in libexpat up to 2.4.4. It has been classified as problematic. This affects an unknown code block of the file xmltok_impl.c of the component UTF-8 Character Handler. The manipulation with an unknown input leads to a encoding error vulnerability. CWE is classifying the issue as CWE-172. The product does not properly encode or decode the data, resulting in unexpected values. The impact remains unknown.

The weakness was released 02/16/2022. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2022-25235 since 02/16/2022. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 236603 (Alibaba Cloud Linux 3 : 0021: expat (ALINUX3-SA-2022:0021)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.4.5 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (236603). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

libexpat

Version

Website

Product: https://github.com/libexpat/libexpat/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Encoding error
CWE: CWE-172
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 236603
Nessus Name: Alibaba Cloud Linux 3 : 0021: expat (ALINUX3-SA-2022:0021)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libexpat 2.4.5
Patch: github.com

Timelineinfo

02/16/2022 🔍
02/16/2022 +0 days 🔍
02/16/2022 +0 days 🔍
05/20/2025 +1189 days 🔍

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2022-25235 (🔍)
GCVE (CVE): GCVE-0-2022-25235
GCVE (VulDB): GCVE-100-193191

Entryinfo

Created: 02/16/2022 08:18
Updated: 05/20/2025 18:17
Changes: 02/16/2022 08:18 (39), 02/18/2022 16:03 (1), 05/20/2025 18:17 (17)
Complete: 🔍
Cache ID: 216::103