An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Smuggling attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the proxy cache and any downstream caches with content from an arbitrary source. When configured for relaxed header parsing (the default), Squid relays headers containing whitespace characters to upstream servers. When this occurs as a prefix to a Content-Length header, the frame length specified will be ignored by Squid (allowing for a conflicting length to be used from another Content-Length header) but relayed upstream.
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Plain-English explanation, risk summary, and remediation steps will appear here once AI analysis is complete.
No Fix Known
No patch has been released yet. Apply workarounds or mitigations where available.
| Vendor | Product | Versions | Fixed In |
|---|---|---|---|
| squid-cache | squid | 4.13 | - |
| squid-cache | squid | 5.0 - 5.0.4 |
Published
CVE disclosed publicly
Last Modified
Most recent update
Indexed to CVEInsight
Added to this platform
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
12
Affected Products
26
References
squid-cache / squid
| - |
| canonical | ubuntu_linux | - | - |
| canonical | ubuntu_linux | - | - |
| canonical | ubuntu_linux | - | - |
| debian | debian_linux | - | - |
| debian | debian_linux | - | - |
| fedoraproject | fedora | - | - |
| fedoraproject | fedora | - | - |
| fedoraproject | fedora | - | - |
| opensuse | leap | - | - |
| opensuse | leap | - | - |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Exploitability
Impact