Vulnerability identifier: #VU88221
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:
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: 7.4.0 - 7.4.2, 7.3.0 - 7.3.1, 7.2.0 - 7.2.1, 7.1.0 - 7.1.2, 7.0.0 - 7.0.3, 6.0.6 - 6.0.12, 6.6.0 - 6.6.2, 6.5.0 - 6.5.2, 6.4.0, 6.2.2 - 6.2.3, 6.3.0 - 6.3.2
Varnish Enterprise: 6.0.9r6 - 6.0.12r5
External links
http://varnish-cache.org/security/VSV00014.html
http://varnish-cache.org/docs/7.5/whats-new/changes-7.5.html#security
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.