CVE-2019-9900 describes a vulnerability in Envoy 1.9.0 and earlier where embedded null characters in HTTP/1.x header values are not properly rejected, potentially allowing attackers to bypass header matching rules. This high-severity vulnerability (CVSS 8.3) affects envoyproxy envoy, envoyproxy openshift_service_mesh, redhat envoy, and redhat openshift_service_mesh, enabling unauthorized access to resources with low attack complexity and no user interaction. While there is no evidence of active exploitation, public exploit code, or inclusion in the KEV catalog, the vulnerability has garnered some community discussion, indicating awareness.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 1.9.0CPE matchmatch criteria | cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* | ||
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:a:redhat:openshift_service_mesh:-:*:*:*:*:*:*:* |
CVSS version used by this source: 3.0
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.