CVE-2021-43824 — NULL Pointer Dereference in Envoy

CWE-476 — NULL Pointer Dereference4 documents4 sources
Severity
7.5HIGHNVD
EPSS
0.1%
top 68.33%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Github.com Pomerium PomeriumEnvoyproxy Envoy
Timeline
PublishedFeb 22
Latest updateMar 1

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages3 packages

▶NVDenvoyproxy/envoy1.19.0 — 1.19.3+3
▶CVEListV5envoyproxy/envoy>= 1.19.0, < 1.19.3, >= 1.20.0, < 1.20.2, >= 1.21.0, < 1.21.1+2

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

2
OSV
Multiple security issues in Pomerium's embedded envoy↗2022-03-01
▶
GHSA
Multiple security issues in Pomerium's embedded envoy↗2022-03-01
▶

📋Vendor Advisories

1
Red Hat
envoy: Null pointer dereference when using JWT filter safe_regex match↗2022-02-22
▶
CVE-2021-43824 — NULL Pointer Dereference in Envoy | cvebase