Vulnerability Details : CVE-2016-4538

Potential exploit
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 2016-05-22 01:59:23
Updated 2025-04-12 10:46:41
Source Debian GNU/Linux
View at NVD,   CVE.org
Vulnerability category: Denial of service

Products affected by CVE-2016-4538

Threat overview for CVE-2016-4538

Top countries where our scanners detected CVE-2016-4538
Top open port discovered on systems with this issue 80
IPs affected by CVE-2016-4538 471,891
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2016-4538!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2016-4538

EPSS FAQ
2.47%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 84 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2016-4538

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.5
 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P
10.0
6.4
 NIST
9.8
 CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
 NIST

CWE ids for CVE-2016-4538

  • The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2016-4538

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