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 | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
5.3 | $0-$5k | 0.00 |
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.
Product
Vendor
Name
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 5.5VulDB Meta Temp Score: 5.3
VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
Exploiting
Class: Request smugglingCWE: CWE-444
ATT&CK: Unknown
Local: No
Remote: Partially
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔍
Upgrade: Cache/Enterprise LTS 6.0.8/6.0.8r3/6.5.2/6.6.1
Patch: github.com
Timeline
07/14/2021 🔍07/15/2021 🔍
07/15/2021 🔍
07/18/2021 🔍
Sources
Advisory: docs.varnish-software.comStatus: Confirmed
CVE: CVE-2021-36740 (🔍)
Entry
Created: 07/15/2021 11:18Updated: 07/18/2021 20:36
Changes: 07/15/2021 11:18 (38), 07/18/2021 20:36 (2)
Complete: 🔍
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