CVE-2024-23326

Summary

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 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.

Affected Software

VendorProductVersion RangeStatus
envoyproxyenvoy>= 1.13.0, <= 1.30.1affected
envoyproxyenvoy>= 1.29.0, <= 1.29.4affected
envoyproxyenvoy>= 1.28.0, <= 1.28.3affected
envoyproxyenvoy<= 1.27.5affected

Weaknesses

  • CWE-391: CWE-391: Unchecked Error Condition

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References