Varnish Cache/Enterprise prior LTS 6.0.8/6.0.8r3/6.5.2/6.6.1 HTTP/2 request smuggling

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$0-$5k0.00

A vulnerability was found in Varnish Cache and Enterprise. It has been declared as critical. This vulnerability affects some unknown processing of the component HTTP2 Handler. The manipulation with an unknown input leads to a request smuggling vulnerability. The CWE definition for the vulnerability is CWE-444. The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 07/15/2021. The advisory is available at docs.varnish-software.com. This vulnerability was named CVE-2021-36740. The technical details are unknown and an exploit is not available.

Upgrading to version LTS 6.0.8, 6.0.8r3, 6.5.2 or 6.6.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Productinfo

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Request smuggling
CWE: CWE-444
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Cache/Enterprise LTS 6.0.8/6.0.8r3/6.5.2/6.6.1
Patch: github.com

Timelineinfo

07/14/2021 🔍
07/15/2021 +1 days 🔍
07/15/2021 +0 days 🔍
07/18/2021 +3 days 🔍

Sourcesinfo

Advisory: docs.varnish-software.com
Status: Confirmed

CVE: CVE-2021-36740 (🔍)

Entryinfo

Created: 07/15/2021 11:18
Updated: 07/18/2021 20:36
Changes: 07/15/2021 11:18 (38), 07/18/2021 20:36 (2)
Complete: 🔍

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