PT-2024-2652 · Envoy+1 · Envoy+1

Bartek Nowotarski · Published 2024-01-05 · Updated 2025-09-04 · CVE-2024-27919

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Envoy versions 1.29.0 through 1.29.1

Description The issue is related to the Envoy HTTP/2 protocol stack, which is vulnerable to a flood of CONTINUATION frames. This occurs because Envoy's HTTP/2 codec does not reset a request when header map limits have been exceeded, allowing an attacker to send a sequence of CONTINUATION frames without the END HEADERS bit set, causing unlimited memory consumption. This can lead to denial of service through memory exhaustion.

Recommendations For Envoy versions 1.29.0 and 1.29.1, upgrade to version 1.29.2 to mitigate the effects of the CONTINUATION flood. As a temporary workaround for versions 1.29.0 and 1.29.1, consider downgrading to version 1.28.1 or earlier. Alternatively, for versions 1.29.0 and 1.29.1, disable the HTTP/2 protocol for downstream connections as a workaround.

Exploit

Fix

DoS

Resource Exhaustion

Weakness Enumeration

CWE-400

CWE-390

Related Identifiers

BDU:2024-02719

BIT-ENVOY-2024-27919

CVE-2024-27919

GHSA-GGHF-VFXP-799R

Affected Products

Envoy

Red Os

References · 21

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/27xxx/CVE-2024-27919.json · Exploit
• https://github.com/envoyproxy/envoy/commit/57a02565532c18eb9df972a3e8974be3ae59f2d5 · Patch
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-gghf-vfxp-799r · Patch
• https://osv.dev/vulnerability/CVE-2024-27919 · Vendor Advisory
• https://bdu.fstec.ru/vul/2024-02719 · Security Note
• http://repo.red-soft.ru/redos/7.3c/x86_64/updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-27919 · Security Note
• https://osv.dev/vulnerability/BIT-envoy-2024-27919 · Vendor Advisory
• https://t.me/echeloneyes/2638 · Telegram Post
• https://t.me/cveNotify/134312 · Telegram Post
• http://openwall.com/lists/oss-security/2024/04/05/3 · Note
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti/uyazvimost-consul-cve-2024-27919 · Note
• https://t.me/cvenotify/75735 · Telegram Post
• https://nowotarski.info/http2-continuation-flood · Note
• https://t.me/proxy_bar/1998 · Telegram Post