Vulnerability identifier: #VU60244

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-2021-41055

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Gajim
Client/Desktop applications / Messaging software

Vendor: Gajim

Description

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

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send a specially crafted XMPP Last Message Correction (XEP-0308) message in multi-user chat, where the message ID equals the correction ID and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Gajim: 1.2.0 - 1.3.2

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External links
http://dev.gajim.org/gajim/gajim/-/tags/gajim-1.3.3
http://dev.gajim.org/gajim/gajim/-/issues/10638

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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.