#VU88221 Resource exhaustion in Varnish Cache and Varnish Enterprise - CVE-2024-30156

Vulnerability identifier: #VU88221

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-2024-30156

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Varnish Cache
Server applications / IDS/IPS systems, Firewalls and proxy servers
Varnish Enterprise
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Varnish Software

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 when handling HTTP/2 requests. 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

Varnish Cache: 6.0.6 - 6.0.12, 6.2.2 - 6.2.3, 6.3.0 - 6.3.2, 6.4.0, 6.5.0 - 6.5.2, 6.6.0 - 6.6.2, 7.0.0 - 7.0.3, 7.1.0 - 7.1.2, 7.2.0 - 7.2.1, 7.3.0 - 7.3.1, 7.4.0 - 7.4.2

Varnish Enterprise: 6.0.9r6 - 6.0.12r5

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External links
https://varnish-cache.org/security/VSV00014.html
https://varnish-cache.org/docs/7.5/whats-new/changes-7.5.html#security

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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.