CVE-2019-18678
5.3
MEDIUM
CVSS 3.1
EPSS 12.5%
Description
An issue was discovered in Squid 3.x and 4.x through 4.8. It allows attackers to smuggle HTTP requests through frontend software to a Squid instance that splits the HTTP Request pipeline differently. The resulting Response messages corrupt caches (between a client and Squid) with attacker-controlled content at arbitrary URLs. Effects are isolated to software between the attacker client and Squid. There are no effects on Squid itself, nor on any upstream servers. The issue is related to a request header containing whitespace between a header name and a colon.
How to fix CVE-2019-18678
To remediate CVE-2019-18678, upgrade the affected package to a fixed version below.
- —upgrade to 4.9-1 or later
Is CVE-2019-18678 being exploited?
Moderate — EPSS is 12.5%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (1)
- from 0, < 4.9-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |