CVE-2019-15226
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 65.4%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 65.39% probability · 99th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- envoyproxy/envoy
- Source
- cve@mitre.org
References
- https://github.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5014Patch, Third 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/afc39bea36fd436e54262f150c009e8d72db5014Patch, Third Party Advisory
- https://github.com/envoyproxy/envoy/commits/masterThird Party Advisory
- https://github.com/envoyproxy/envoy/issues/8520Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.