Vulnerability in Envoyproxy Envoy
CVE-2019-18802
An issue was discovered in Envoy 1.12.0. An untrusted remote client may send an HTTP header (such as Host) with whitespace after the header content. Envoy will treat "header-value " as a different string from "header-value" so for example with the Host header "example.com " one could bypass "example.com" matchers.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.025 (84.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000
Affected products
References
- github.com/envoyproxy/envoy/commits/master (Patch)
- groups.google.com/forum/
- blog.envoyproxy.io (Product)
- github.com/envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4 (Exploit, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-03/msg00034.html (vendor-advisory)
Frequently asked questions
- What is CVE-2019-18802?
- CVE-2019-18802 is a critical-severity vulnerability in Envoyproxy Envoy. CVSS score: 9.8/10. Published 2019-12-13.
- How severe is CVE-2019-18802?
- Critical severity. CVSS v3 base score is 9.8 out of 10.