Vulnerability Monitor

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CVE-2016-4538

The bcpowmod function in ext/bcmath/bcmath.c in PHP before 5.5.35, 5.6.x before 5.6.21, and 7.x before 7.0.6 modifies certain data structures without considering whether they are copies of the _zero_, _one_, or _two_ global variable, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted call.

Published

2016-05-22T01:59:22.933

Last Modified

2025-04-12T10:46:40.837

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 9.8 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: PARTIAL
  • Availability Impact: PARTIAL
Exploitability Score

10.0

Impact Score

6.4

Weaknesses
  • Type: Primary
    CWE-20
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application php php ≤ 5.5.33 Yes
Application php php 5.6.0 Yes
Application php php 5.6.1 Yes
Application php php 5.6.2 Yes
Application php php 5.6.3 Yes
Application php php 5.6.4 Yes
Application php php 5.6.5 Yes
Application php php 5.6.6 Yes
Application php php 5.6.7 Yes
Application php php 5.6.8 Yes
Application php php 5.6.9 Yes
Application php php 5.6.10 Yes
Application php php 5.6.11 Yes
Application php php 5.6.12 Yes
Application php php 5.6.13 Yes
Application php php 5.6.14 Yes
Application php php 5.6.15 Yes
Application php php 5.6.16 Yes
Application php php 5.6.17 Yes
Application php php 5.6.18 Yes
Application php php 5.6.19 Yes
Application php php 5.6.20 Yes
Application php php 7.0.0 Yes
Application php php 7.0.1 Yes
Application php php 7.0.2 Yes
Application php php 7.0.3 Yes
Application php php 7.0.4 Yes
Application php php 7.0.5 Yes
Operating System fedoraproject fedora 24 Yes
Operating System opensuse leap 42.1 Yes
References