CVE-2019-18277 describes a flaw in HAProxy versions prior to 2.0.6, where the load balancer failed to properly reject HTTP messages with an invalid "transfer-encoding" header in legacy mode. This vulnerability, while limited in direct impact, could facilitate HTTP request smuggling attacks when combined with the "http-reuse always" setting and a lenient downstream parser. Rated with a CVSS score of 7.5 (High), it has a low attack complexity and does not require user interaction, potentially leading to high integrity impact. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 2.0.6CPE matchmatch criteria | cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.