Servers and applications
CVE-2016-4554
mime_header.cc in Squid before 3.5.18 allows remote attackers to bypass intended same-origin restrictions and possibly conduct cache-poisoning attacks via a crafted HTTP Host header, aka a "header smuggling" issue.
- Severity
- High 8.6
- Published
- 10 May 2016
- Last changed
- 17 Jun 2026
- Added to UpHeron
- 1 Nov 2026
- Exploit chance
- 39% in the next 30 daysHigher than 98% of CVEs. EPSS by FIRST, 11 Nov 2026
- Attack
- Over the network · No login needed · No user action needed
- Attacker can
- Change data
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N- Sources
- NVD
Affected software
| Software | Affected versions |
|---|---|
SquidServers and applications · cpe:a:squid-cache:squid |
|