CVE-2019-18838
An issue was discovered in Envoy 1.12.0.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header, it sends an internally generated "Invalid request" response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request's Host header causes a NULL pointer dereference, resulting in abnormal termination of the Envoy process.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.14% probability · 82th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- envoyproxy/envoy
- Source
- cve@mitre.org
EPSS 2.1% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://blog.envoyproxy.ioProduct
- https://github.com/envoyproxy/envoy/commits/masterPatch
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhcExploit, Third Party Advisory
- https://groups.google.com/forum/#%21forum/envoy-users
- https://blog.envoyproxy.ioProduct
- https://github.com/envoyproxy/envoy/commits/masterPatch
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhcExploit, Third Party Advisory
- https://groups.google.com/forum/#%21forum/envoy-users
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.