CVE-2024-23326
Published: 04 June 2024
Summary
CVE-2024-23326 is a medium-severity Unchecked Error Condition (CWE-391) vulnerability in Envoyproxy Envoy. Its CVSS base score is 5.9 (Medium).
Operationally, ranked at the 24.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-20841
Vulnerability details
Envoy is a cloud-native, open source edge and service proxy. A theoretical request smuggling vulnerability exists through Envoy if a server can be tricked into adding an upgrade header into a response. Per RFC https://www.rfc-editor.org/rfc/rfc7230#section-6.7 a server sends 101 when…
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switching protocols. Envoy incorrectly accepts a 200 response from a server when requesting a protocol upgrade, but 200 does not indicate protocol switch. This opens up the possibility of request smuggling through Envoy if the server can be tricked into adding the upgrade header to the response.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Ensures audit logging process failures are checked and trigger defined responses instead of remaining unchecked.
Policy enforces checking and handling of error conditions as part of incident response processes.
Testing IR effectiveness identifies and drives fixes for unchecked error conditions that fail to initiate incident handling.
Formal incident handling procedures enforce checking and acting on error conditions that could indicate security incidents.
Mandates ongoing correlation, analysis, and response to monitoring results, reducing unchecked error conditions from control assessments.