Buffer overflow in Envoyproxy Envoy
CVE-2019-18801
An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.025 (84.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/envoyproxy/envoy/commits/master (Patch)
- groups.google.com/forum/
- blog.envoyproxy.io (Product)
- github.com/envoyproxy/envoy/security/advisories/GHSA-gxvv-x4p2-rppp (Exploit, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:4222 (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-18801?
- CVE-2019-18801 is a critical-severity vulnerability in Envoyproxy Envoy, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-12-13.
- How severe is CVE-2019-18801?
- Critical severity. CVSS v3 base score is 9.8 out of 10.