#VU20863 Reachable Assertion in Varnish Cache - CVE-2019-15892

Vulnerability identifier: #VU20863

Vulnerability risk: Low

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

CVE-ID: CVE-2019-15892

CWE-ID: CWE-617

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Varnish Cache
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 a reachable assertion when parsing HTTP/1 requests. A remote attacker can send specially crafted HTTP/1 requests to the affected server and trigger application restart, resulting in a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Varnish Cache: 6.0.0 - 6.0.3, 6.1.0 - 6.1.1, 6.2.0

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External links
https://varnish-cache.org/security/VSV00003.html

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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.