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9.8

Envoy 1.12.0 lets remote users corrupt memory and bypass controls

CVE-2019-18801 · published 6 years ago
Summary

The Envoy service version 1.12.0 can be tricked by an outside client using specially crafted HTTP/2 requests when it talks to an older HTTP/1 backend. This can corrupt internal data, let the attacker avoid routing rules, and even change other users' requests. Update Envoy to a newer version or apply the vendor's recommended patch as soon as possible.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
envoyproxy envoy <= 1.12.1
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
Original advisory text
An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to c...
An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker full control (estimated)
Severity
9.8 Critical
Exploitation
3% chance of attack within 30 days
Type
CWE-787Out-of-bounds Write
Timeline
Published13 Dec 2019
Updated30 Oct 2026
First seen29 Sep 2026
Sources
CVE-2019-18801 · NVD
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