Denial of service in Varnish Cache and Varnish Enterprise



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2024-30156
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
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

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU88221

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 - Resource exhaustion

Exploit availability: No

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 - 7.4.2

Varnish Enterprise: 6.0.9r6 - 6.0.12r5

CPE2.3 External links

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


Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



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