CVE-2019-18802: envoyproxy envoy
Vulnerability summary
CVE-2019-18802 is a critical (CVSS 9.8) vulnerability in envoyproxy envoy. EPSS estimates a 2.46% chance of exploitation in the next 30 days, higher than 84.2% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 1Timeline
- 13-12-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
2.46%
Chance of exploitation in the next 30 days
Percentile
84%
Versus all other CVEs
30-day change
0.00 pp
From 2.46% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundEnvoy
Maturity: poc
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Opensuse5 products
- nghttp2-python&distro=openSUSE Leap 15.1< 1.40.0-lp151.3.6.1
- nghttp2-python&distro=openSUSE Leap 15.2< 1.40.0-lp152.2.3.1
- nghttp2&distro=openSUSE Leap 15.1< 1.40.0-lp151.3.6.1
- nghttp2&distro=openSUSE Leap 15.2< 1.40.0-lp152.2.3.1
- nghttp2&distro=openSUSE Tumbleweed< 1.64.0-1.1
Envoyproxy1 product
- envoy≤ 1.12.1
Mageia1 product
- nghttp2< 1.38.0-1.2.mga7
Suse1 product
- nghttp2&distro=SUSE Linux Enterprise Module for Basesystem 15 SP1< 1.40.0-3.6.3
4 vendors · 8 products
References
15 links- groups.google.com/forum/X Refsource MISC
- github.com/envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4X Refsource MISCExploitThird Party Advisory
Show all 15 references
- lists.opensuse.org/archives/…Advisory
- lists.opensuse.org/archives/…Advisory
- lists.opensuse.org/archives/…Advisory