THREATPORT/VULNERABILITY/CVE-2016-4538
CRITICAL SEVERITY

CVE-2016-4538

Php vulnerability

CVSS
9.8
EPSS
6.2%
EPSS pct
93th
Exploited
No known
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.
Affected vendor
Php
Affected product
Php
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-20 — Improper Input Validation
Published
2016-05-22

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 6.2% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 93% of all scored CVEs.

Check your external exposure to CVE-2016-4538

  • Confirm whether Php Php is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2016-4538.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2016-4538

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2016-4538 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

Run a free external exposure scan

Are you exposed to CVE-2016-4538?

Run an instant, non-intrusive external scan to check your attack surface for CVE-2016-4538.

Start free scan

No credit card. Agentless.

Related vulnerabilities

CRITICAL
CVE-2018-15531
Javamelody vulnerability
CRITICAL
CVE-2018-7103
Intelligent Management Center Wireless Services Manager Software vulnerability
CRITICAL
CVE-2018-7104
Intelligent Management Center Wireless Services Manager Software vulnerability