CVE-2024-27919: envoyproxy envoy
Vulnerability summary
CVE-2024-27919 is a high (CVSS 7.5) vulnerability in envoyproxy envoy. EPSS estimates a 86.75% chance of exploitation in the next 30 days, higher than 99.7% of scored vulnerabilities.
Timeline
- 04-04-2024PublishedVulnerability first disclosed.
- 04-11-2025Last modifiedVulnerability information updated.
Description
Envoy is a cloud-native, open-source edge and service proxy. In versions 1.29.0 and 1.29.1, theEnvoy HTTP/2 protocol stack is vulnerable to the flood of CONTINUATION frames. Envoy's HTTP/2 codec does not reset a request when header map limits have been exceeded. This allows an attacker to send an sequence of CONTINUATION frames without the END_HEADERS bit set causing unlimited memory consumption. This can lead to denial of service through memory exhaustion. Users should upgrade to versions 1.29.2 to mitigate the effects of the CONTINUATION flood. Note that this vulnerability is a regression in Envoy version 1.29.0 and 1.29.1 only. As a workaround, downgrade to version 1.28.1 or earlier or disable HTTP/2 protocol for downstream connections.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
86.75%
Chance of exploitation in the next 30 days
Percentile
100%
Versus all other CVEs
30-day change
0.00 pp
From 86.75% on 20-09-2026
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
- envoyEOL≥ 1.29.0, < 1.29.2 | 1.29.0 | 1.29.1
1 vendor · 1 product
References
5 links- github.com/envoyproxy/envoy/security/advisories/GHSA-gghf-vfxp-799rX Refsource CONFIRMPatchThird Party Advisory
- www.openwall.com/lists/oss-security/2024/04/05/3Mailing List