Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Envoyproxy | Envoy | 1.0.0 |
Related Weaknesses (CWE)
References
- https://github.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5PatchThird Party Advisory
- https://github.com/envoyproxy/envoy/commits/masterThird Party Advisory
- https://github.com/envoyproxy/envoy/issues/8520Third Party Advisory
- https://github.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5PatchThird Party Advisory
- https://github.com/envoyproxy/envoy/commits/masterThird Party Advisory
- https://github.com/envoyproxy/envoy/issues/8520Third Party Advisory
FAQ
What is CVE-2019-15226?
CVE-2019-15226 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 versi...
How severe is CVE-2019-15226?
CVE-2019-15226 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-15226?
Check the references section above for vendor advisories and patch information. Affected products include: Envoyproxy Envoy.