CVE-2019-9900
HIGH
8.3
CVSS Score
Published: April 25, 2019 at 02:55 PM UTC
Updated: June 17, 2026 at 02:44 AM UTC
2 products affected across 2 vendorsEnvoyOpenShift Service Mesh
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Severity
HIGH8.3
Exploit prediction
EPSS 4%
Description
When parsing HTTP/1.x header values, Envoy 1.9.0 and before does not reject embedded zero characters (NUL, ASCII 0x0). This allows remote attackers crafting header values containing embedded NUL characters to potentially bypass header matching rules, gaining access to unauthorized resources.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v ≤ 1.9.0
OpenShift Service Mesh· Red Hatcontainer
95%All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (5)
Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://access.redhat.com/errata/RHSA-2019:0741x_refsource_CONFIRMExploitIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/envoyproxy/envoy/issues/6434x_refsource_CONFIRMExploitMitigationThird Party Advisory
Source: [email protected]
https://github.com/envoyproxy/envoy/security/advisories/GHSA-x74r-f4mw-c32hx_refsource_CONFIRM
Source: [email protected]
https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAMx_refsource_CONFIRMRelease NotesVendor Advisory
Source: [email protected]
https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_historyCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- CHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- LOW
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-74
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