CVE-2021-29258: envoyproxy envoy Reachable Assertion
CVSS: 7.5v3.1HighModified
Published 20-05-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-29258 is a high (CVSS 7.5) Reachable Assertion vulnerability in envoyproxy envoy. EPSS estimates a 1.77% chance of exploitation in the next 30 days, higher than 77.8% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
1.77%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2Timeline
- 20-05-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in Envoy 1.14.0. There is a remotely exploitable crash for HTTP2 Metadata, because an empty METADATA map triggers a Reachable Assertion.
CVSS metrics
2 scores · 1 source · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesSingle source
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.77%
Chance of exploitation in the next 30 days
Percentile
78%
Versus all other CVEs
30-day change
0.00 pp
From 1.77% on 19-09-2026
19-09-202619-10-2026
EPSS score1.77%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Envoyproxy1 product
- envoyEOL1.14.6 | 1.15.3 | 1.16.2 | 1.17.1
1 vendor · 1 product
References
5 links- github.com/envoyproxy/envoy/security/advisories/GHSA-xw4q-6pj2-5gfgX Refsource MISCNot ApplicableThird Party Advisory
- github.com/envoyproxy/envoy/security/advisories/GHSA-rqvq-hxw5-776jThird Party Advisory