Vulnerability Monitor

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CVE-2021-43824

Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions a crafted request crashes Envoy when a CONNECT request is sent to JWT filter configured with regex match. This provides a denial of service attack vector. The only workaround is to not use regex in the JWT filter. Users are advised to upgrade.

Published

2022-02-22T23:15:10.813

Last Modified

2024-11-21T06:29:52.380

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Primary
CWE-476

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	envoyproxy	envoy	< 1.18.6	Yes
Application	envoyproxy	envoy	< 1.19.3	Yes
Application	envoyproxy	envoy	< 1.20.2	Yes
Application	envoyproxy	envoy	< 1.21.1	Yes

References

https://github.com/envoyproxy/envoy/commit/9371333230b1a6e1be2eccf4868771e11af6253a Patch, Third Party Advisory ([email protected])
https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2p Issue Tracking, Third Party Advisory ([email protected])
https://github.com/envoyproxy/envoy/commit/9371333230b1a6e1be2eccf4868771e11af6253a Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2p Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)