#VU77545 Improper Check for Unusual or Exceptional Conditions in engine.io - CVE-2022-21676

Vulnerability identifier: #VU77545

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-21676

CWE-ID: CWE-754

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
engine.io
Other software / Other software solutions

Vendor: socket.io

Description

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

The vulnerability exists due to improper error handling. A remote attacker can send specially crafted HTTP request to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

engine.io: 4.0.0 - 6.1.0

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External links
https://github.com/socketio/engine.io/security/advisories/GHSA-273r-mgr4-v34f
https://github.com/socketio/engine.io/commit/c0e194d44933bd83bf9a4b126fca68ba7bf5098c
https://github.com/socketio/engine.io/commit/66f889fc1d966bf5bfa0de1939069153643874ab
https://github.com/socketio/engine.io/commit/a70800d7e96da32f6e6622804ef659ebc58659db
https://github.com/socketio/engine.io/releases/tag/6.1.1
https://github.com/socketio/engine.io/releases/tag/5.2.1
https://github.com/socketio/engine.io/releases/tag/4.1.2
https://security.netapp.com/advisory/ntap-20220209-0002/

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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.