Vulnerability identifier: #VU59642

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-45960

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
expat
Universal components / Libraries / Libraries used by multiple products

Vendor: libexpat.org

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources in the storeAtts() function in xmlparse.c. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

expat: 2.0.0 - 2.4.2

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External links
http://github.com/libexpat/libexpat/issues/531
http://github.com/libexpat/libexpat/pull/534
http://bugzilla.mozilla.org/show_bug.cgi?id=1217609

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.