Priority reviewHigh

CVE-2023-46847

Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 7.6 Advanced Update Support

Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest Authentication.

CVSS
7.5
EPSS
88.4%
99.8% percentile
CISA KEV
Not listed
Published
2023.11.03
PRIORITY ASSESSMENT

Priority review

FIRST EPSS indicates an elevated probability of exploitation.

Known exploitationNot established by KEV
Exploit probability88.4%
Technical severityCVSS 7.5

Vulnerability overview

Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest Authentication.

Affected product and versions

Product
Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 7.6 Advanced Update Support
Affected versions
>= 3.2.0.1 < 6.4, 8.0, 9.0, 8.6, 8.8, 9.2, 8.0 aarch64, 8.0 s390x, 8.0 ppc64le, 7.0, 8.2, 8.4
Fixed versions
6.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 7.6 Advanced Update Support and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-120