Cyber Resilience

CVE-2024-53271

Envoyproxy Envoy 1.31.0 – 1.31.5

Public PoC
Published
18 December 2024
Modified
04 September 2025
Patch / advisory
View advisory
CVSS Score v3.1 7.1
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
EPSS Score 0.0062 46th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2024-53271 is a high-severity Always-Incorrect Control Flow Implementation (CWE-670) vulnerability in Envoyproxy Envoy. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 46th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability Data

Envoy is a cloud-native high-performance edge/middle/service proxy. In affected versions envoy does not properly handle http 1.1 non-101 1xx responses. This can lead to downstream failures in networked devices. This issue has been addressed in versions 1.31.5 and 1.32.3. Users…

more

are advised to upgrade. There are no known workarounds for this issue.

CWE(s)
CWE-670

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
Why these techniques?

Vulnerability allows exploitation of Envoy proxy's HTTP/1.1 handling (non-101 1xx responses) to cause parsing errors, connection resets, and downstream service failures, enabling application-level denial of service.

MITRE ATLAS TechniquesAI

MITRE ATLAS techniques

AML.T0048: External Harms

CVEs Like This One

CVE-2024-53269Same product: Envoyproxy Envoy
CVE-2024-53270Same product: Envoyproxy Envoy
CVE-2024-45809Same product: Envoyproxy Envoy
CVE-2026-47204Same product: Envoyproxy Envoy
CVE-2024-45807Same product: Envoyproxy Envoy
CVE-2024-34364Same product: Envoyproxy Envoy
CVE-2024-23327Same product: Envoyproxy Envoy
CVE-2026-47220Same product: Envoyproxy Envoy
CVE-2026-47205Same product: Envoyproxy Envoy
CVE-2024-45810Same product: Envoyproxy Envoy

Affected Assets

envoyproxy
envoy
1.31.0 — 1.31.5 · 1.32.0 — 1.32.3

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V9.2.1

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly prevent incorrect control-flow implementations via reviews, testing, and static analysis.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
detects

Security testing in development and acceptance can detect paths that deviate from intended logic.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle processes can catch incorrect control-flow logic during design and code review.

A.8.28 Secure coding partial match
prevents

Secure coding standards and reviews directly target flawed control-flow implementations.

A.8.32 Change management partial match
prevents

Change-management gates may prevent deployment of flawed logic but do not address the coding defect itself.

References