CVE-2016-4556

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

23.11% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 97.6% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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

2016-05-10 19:00Z10 YR AGO

Last updated

2024-08-06 00:32Z2 YR AGO

Reserved

2016-05-06

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

2bab0b8a9494ca95d4e60e2d42e6d8fc77a8a5cb00f9633d20740bdf3eb8f51b

• security.gentoo.orgGLSA-201607-01https://security.gentoo.org/glsa/201607-01vendor-advisoryx_refsource_GENTOO
• www.squid-cache.orghttp://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2016_9.patchx_refsource_CONFIRM
• www.oracle.comhttp://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlx_refsource_CONFIRM
• lists.opensuse.orgSUSE-SU-2016:1996http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.htmlvendor-advisoryx_refsource_SUSE
• www.squid-cache.orghttp://www.squid-cache.org/Versions/v3/3.4/changesets/SQUID-2016_9.patchx_refsource_CONFIRM
• www.ubuntu.comUSN-2995-1http://www.ubuntu.com/usn/USN-2995-1vendor-advisoryx_refsource_UBUNTU
• www.openwall.com[oss-security] 20160506 Re: CVE Request: Squid HTTP caching proxyhttp://www.openwall.com/lists/oss-security/2016/05/06/5mailing-listx_refsource_MLIST
• access.redhat.comRHSA-2016:1140https://access.redhat.com/errata/RHSA-2016:1140vendor-advisoryx_refsource_REDHAT
• lists.opensuse.orgopenSUSE-SU-2016:2081http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.htmlvendor-advisoryx_refsource_SUSE
• www.securitytracker.com1035770http://www.securitytracker.com/id/1035770vdb-entryx_refsource_SECTRACK
• access.redhat.comRHSA-2016:1138https://access.redhat.com/errata/RHSA-2016:1138vendor-advisoryx_refsource_REDHAT
• www.squid-cache.orghttp://www.squid-cache.org/Advisories/SQUID-2016_9.txtx_refsource_CONFIRM
• access.redhat.comRHSA-2016:1139https://access.redhat.com/errata/RHSA-2016:1139vendor-advisoryx_refsource_REDHAT
• lists.opensuse.orgSUSE-SU-2016:2089http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.htmlvendor-advisoryx_refsource_SUSE
• www.openwall.com[oss-security] 20160506 CVE Request: Squid HTTP caching proxyhttp://www.openwall.com/lists/oss-security/2016/05/06/3mailing-listx_refsource_MLIST
• www.debian.orgDSA-3625http://www.debian.org/security/2016/dsa-3625vendor-advisoryx_refsource_DEBIAN