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CVE-2019-9900

MEDIUM
Published 2019-04-25T14:55:57
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Expert Analysis

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CVSS Score

V3.0
6.5
/10
CVSS:3.0/AC:H/AV:N/A:L/C:L/I:L/PR:N/S:C/UI:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.000
probability
of exploitation in the wild

There is a 0.0% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.140
Higher than 14.0% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED

Impact Metrics

Confidentiality
LOW
Integrity
LOW
Availability
LOW

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-h9r7-c397-3wqr

Advisory Details

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.

CVSS Scoring

CVSS Score

7.5

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

References

WEB https://github.com/envoyproxy/envoy/security/advisories/GHSA-x74r-f4mw-c32h
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2019-9900
WEB https://github.com/envoyproxy/envoy/issues/6434
WEB https://access.redhat.com/errata/RHSA-2019:0741
WEB https://groups.google.com/forum/#!topic/envoy-announce/VoHfnDqZiAM
WEB https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM
WEB https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history

Advisory provided by GitHub Security Advisory Database. Published: May 24, 2022, Modified: April 4, 2024

References

https://access.redhat.com/errata/RHSA-2019:0741
https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history
https://github.com/envoyproxy/envoy/issues/6434
https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM
https://github.com/envoyproxy/envoy/security/advisories/GHSA-x74r-f4mw-c32h

HackerOne Reports

Vulnerability in http-parser & embedded NULL header handling High
htuch
Node.js
Improper Null Termination
View Report
Published: 2019-04-25T14:55:57
Last Modified: 2024-08-04T22:01:55.177Z
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