Vulnerability Details : CVE-2021-21703

Potential exploit
In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.
Published 2021-10-25 06:15:07
Updated 2022-10-29 02:44:24
Source PHP Group
View at NVD,   CVE.org
Vulnerability category: Memory CorruptionBypassGain privilege

Products affected by CVE-2021-21703

Threat overview for CVE-2021-21703

Top countries where our scanners detected CVE-2021-21703
Top open port discovered on systems with this issue 80
IPs affected by CVE-2021-21703 261,763
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2021-21703!
*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-2021-21703

EPSS FAQ
0.31%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 70 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-21703

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.9
 MEDIUM AV:L/AC:M/Au:N/C:C/I:C/A:C
3.4
10.0
 NIST
7.0
 HIGH CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
1.0
5.9
 NIST
7.8
 HIGH CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
1.1
6.0
 PHP Group

CWE ids for CVE-2021-21703

  • The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
    Assigned by: security@php.net (Secondary)
  • The product writes data past the end, or before the beginning, of the intended buffer.
    Assigned by:
    • nvd@nist.gov (Primary)
    • security@php.net (Secondary)

References for CVE-2021-21703

Jump to
This web site uses cookies for managing your session, storing preferences, website analytics and additional purposes described in our privacy policy.
By using this web site you are agreeing to CVEdetails.com terms of use!
Accept Close