CVE-2006-4020

mediumpriority · track · 29EPSS 0.020 · 81 %ileexploit · functionalEUUS
grimoire priorityP1 · Urgent
Exploitable?
Public exploit
1 exploit · functional
Likely / severe?
2.01% (81st) EPSS
CVSS 4.6 · medium
Is it mine?
49 products
Check your exposure
Who says so?
3 sources
enisa_euvd · nvd · redhat_csaf

EPSS · scored 2026-10-27

scanf.c in PHP 5.1.4 and earlier, and 4.4.3 and earlier, allows context-dependent attackers to execute arbitrary code via a sscanf PHP function call that performs argument swapping, which increments an index past the end of an array and triggers a buffer over-read.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedRed Hat Enterprise Linux AS (Advanced Server) version 2.1 redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. This update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system.

    https://access.redhat.com/errata/RHSA-2006:0682
  • FixedRed Hat Enterprise Linux ES version 2.1redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. This update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system.

    https://access.redhat.com/errata/RHSA-2006:0682
  • FixedRed Hat Enterprise Linux WS version 2.1redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. This update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system.

    https://access.redhat.com/errata/RHSA-2006:0682
  • FixedRed Hat Linux Advanced Workstation 2.1redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. This update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system.

    https://access.redhat.com/errata/RHSA-2006:0682
02

cvss

Technical severity, 0–10. One row per scoring source.

4.6
010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.6mediumAV:L/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 3.9 · impact 6.4
v2.04.1mediumAV:L/AC:L/Au:N/C:P/I:P/A:P/E:POCsecondary · CVSS-BT (t0sche)
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-122USLLM-inferredCWE-476USLLM-inferred
04

exploits (1)

Public proof-of-concept and weaponised exploit code.

05

affected products (49)

Products and version ranges known to be affected.

showing 20 of 49
06

advisories (1)

Vendor and ecosystem advisories describing this.

  • RHSA-2006:0682Red Hat Security Advisory: php security update2006-09-21csaf · redhat_csafUS

    Updated PHP packages that fix multiple security issues are now available for Red Hat Enterprise Linux 2.1. This update has been rated as having moderate security impact by the Red Hat Security Response Team.

07

also known as (2)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

enisa_euvdnvdredhat_csafNVDCVE.orgMITRE
published 2006-08-08modified 2026-06-16
09

references (76)

External citations — patches, advisories, analysis.

scry

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