Cyber Resilience

CVE-2021-43824

High

Published: 22 February 2022

Published
22 February 2022
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0013 31.2th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-43824 is a high-severity NULL Pointer Dereference (CWE-476) vulnerability in Envoyproxy Envoy. Its CVSS base score is 7.5 (High).

Operationally, ranked at the 31.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

more

attack vector. The only workaround is to not use regex in the JWT filter. Users are advised to upgrade.

CWE(s)
CWE-476

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

envoyproxy
envoy
≤ 1.18.6 · 1.19.0 — 1.19.3 · 1.20.0 — 1.20.2

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References