CVE-2019-18802
CRITICAL
9.8
CVSS Score
Published: December 13, 2019 at 12:21 PM UTC
Updated: June 17, 2026 at 02:25 AM UTC
1 product affected across 1 vendorEnvoy
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Severity
CRITICAL9.8
Exploit prediction
EPSS 2%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v ≤ 1.12.1
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (5)
Vendor Advisoryx_refsource_SUSE
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00034.htmlx_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-noinfo
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