Vulnerability Details : CVE-2019-15226
Upon receiving each incoming request header data, Envoy will iterate over existing request headers to verify that the total size of the headers stays below a maximum limit. The implementation in versions 1.10.0 through 1.11.1 for HTTP/1.x traffic and all versions of Envoy for HTTP/2 traffic had O(n^2) performance characteristics. A remote attacker may craft a request that stays below the maximum request header size but consists of many thousands of small headers to consume CPU and result in a denial-of-service attack.
Vulnerability category: Denial of service
Products affected by CVE-2019-15226
- cpe:2.3:a:envoyproxy:envoy:1.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.4.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.6.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.11.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.11.2:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.7.1:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.8.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.9.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.9.1:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.3.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.5.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.7.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.10.0:*:*:*:*:*:*:*
- cpe:2.3:a:envoyproxy:envoy:1.11.1:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-15226
8.89%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 91 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-15226
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.8
|
HIGH | AV:N/AC:L/Au:N/C:N/I:N/A:C |
10.0
|
6.9
|
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-2019-15226
-
The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.Assigned by: nvd@nist.gov (Primary)
References for CVE-2019-15226
-
https://github.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5014
Track byteSize of HeaderMap internally. · envoyproxy/envoy@afc39be · GitHubPatch;Third Party Advisory
-
https://github.com/envoyproxy/envoy/issues/8520
CVE-2019-15226 · Issue #8520 · envoyproxy/envoy · GitHubThird Party Advisory
-
https://github.com/envoyproxy/envoy/commits/master
Commits · envoyproxy/envoy · GitHubThird Party Advisory
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