Null pointer dereference in envoy
CVE-2021-43824

7.5HIGH

Key Information:

Vendor

Envoyproxy

Status
Envoy
Vendor
CVE Published:
22 February 2022

What is 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.

Affected Version(s)

envoy >= 1.20.0, < 1.20.2 < 1.20.0, 1.20.2

envoy >= 1.19.0, < 1.19.3 < 1.19.0, 1.19.3

envoy < 1.18.6 < 1.18.6

References

https://github.com/envoyproxy/envoy/security/advisories/G...
x_refsource_CONFIRM
https://github.com/envoyproxy/envoy/commit/9371333230b1a6...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.