Resource exhaustion in Envoyproxy Envoy
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 class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.645 (99.2th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.645 · newest: 0.645 · change: 0.000
Affected products
- Envoyproxy Envoy — versions 1.0.0, 1.1.0, 1.2.0
Weakness classification (CWE)
References
- github.com/envoyproxy/envoy/commits/master (Third Party Advisory)
- github.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5014 (Patch, Third Party Advisory)
- github.com/envoyproxy/envoy/issues/8520 (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-15226?
- CVE-2019-15226 is a high-severity vulnerability in Envoyproxy Envoy, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2019-10-09.
- How severe is CVE-2019-15226?
- High severity. CVSS v3 base score is 7.5 out of 10.