Vulnerability Details : CVE-2019-18838
An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header, it sends an internally generated "Invalid request" response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request's Host header causes a NULL pointer dereference, resulting in abnormal termination of the Envoy process.
Vulnerability category: Memory Corruption
Exploit prediction scoring system (EPSS) score for CVE-2019-18838
Probability of exploitation activity in the next 30 days: 0.40%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 70 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2019-18838
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2019-18838
-
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.Assigned by: nvd@nist.gov (Primary)
References for CVE-2019-18838
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https://github.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhc
DoS via request without the Host header · Advisory · envoyproxy/envoy · GitHubExploit;Third Party Advisory
-
https://blog.envoyproxy.io
Envoy ProxyProduct
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https://groups.google.com/forum/#!forum/envoy-users
envoy-users - Google GroepenMailing List;Third Party Advisory
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https://github.com/envoyproxy/envoy/commits/master
Commits · envoyproxy/envoy · GitHubPatch
Products affected by CVE-2019-18838
- cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*