CVE-2019-18678

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

10.93% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 95.5% of scored records. A rank, not a probability.

NVD base score

5.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2019-11-26 16:15Z6 YR AGO

Last updated

2024-08-05 02:02Z2 YR AGO

Reserved

2019-11-04

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')Base
• CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

e2fc5e280c7d6bf86d553d5ae34460a808f5cb590f51c615105fbc373cf3f269

• github.comhttps://github.com/squid-cache/squid/pull/445x_refsource_MISC
• bugzilla.suse.comhttps://bugzilla.suse.com/show_bug.cgi?id=1156323x_refsource_CONFIRM
• www.squid-cache.orghttp://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52ad22fba0f7443.patchx_refsource_CONFIRM
• www.squid-cache.orghttp://www.squid-cache.org/Advisories/SQUID-2019_10.txtx_refsource_CONFIRM
• usn.ubuntu.comUSN-4213-1https://usn.ubuntu.com/4213-1/vendor-advisoryx_refsource_UBUNTU
• lists.fedoraproject.orgFEDORA-2019-0b16cbdd0ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2019-9538783033https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/vendor-advisoryx_refsource_FEDORA
• lists.debian.org[debian-lts-announce] 20191210 [SECURITY] [DLA 2028-1] squid3 security updatehttps://lists.debian.org/debian-lts-announce/2019/12/msg00011.htmlmailing-listx_refsource_MLIST
• security.gentoo.orgGLSA-202003-34https://security.gentoo.org/glsa/202003-34vendor-advisoryx_refsource_GENTOO
• www.debian.orgDSA-4682https://www.debian.org/security/2020/dsa-4682vendor-advisoryx_refsource_DEBIAN
• lists.debian.org[debian-lts-announce] 20200710 [SECURITY] [DLA 2278-1] squid3 security updatehttps://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlmailing-listx_refsource_MLIST