01 Record

CVE-2021-21703

PHP-FPM memory access in root process leading to privilege escalation

HighPUBLISHEDCNA: php

CNA base score7.8 CVSS v3.xCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

View raw JSON

02 Description

PHP-FPM memory access in root process leading to privilege escalation

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 1.44% probability of exploitation activity in the next 30 days.
EPSS percentile: Ranks above 71.1% of scored records. A rank, not a probability.
NVD base score: 7.0 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-10-25 05:40Z4 YR AGO

Last updated

2024-09-17 03:02Z1 YR AGO

Reserved

2021-01-04

Assigning CNA

php

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE-284Improper Access ControlPillar
CWE-787Out-of-bounds WriteBase
CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.1

Document digest

a23c869d0ba2d06d66f5265dc4dbffab33ac0b19c36c8b6e50b5a48bd5ee1efd

05 Affected products

VendorProductVersionsPlatforms

PHP GroupPHP7.3.x to 7.3.31, 7.4.x to < 7.4.25, 8.0.X to < 8.0.12—

06 References

bugs.php.nethttps://bugs.php.net/bug.php?id=81026x_refsource_MISC
www.debian.orgDSA-4992https://www.debian.org/security/2021/dsa-4992vendor-advisoryx_refsource_DEBIAN
www.debian.orgDSA-4993https://www.debian.org/security/2021/dsa-4993vendor-advisoryx_refsource_DEBIAN
www.openwall.com[oss-security] 20211026 CVE-2021-21703: PHP-FPM 5.3.7 <= 8.0.12 Local Roothttp://www.openwall.com/lists/oss-security/2021/10/26/7mailing-listx_refsource_MLIST
lists.debian.org[debian-lts-announce] 20211027 [SECURITY] [DLA 2794-1] php7.0 security updatehttps://lists.debian.org/debian-lts-announce/2021/10/msg00021.htmlmailing-listx_refsource_MLIST
lists.fedoraproject.orgFEDORA-2021-9f68f5f752https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/vendor-advisoryx_refsource_FEDORA
lists.fedoraproject.orgFEDORA-2021-4140b54de2https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/vendor-advisoryx_refsource_FEDORA
lists.fedoraproject.orgFEDORA-2021-02d218c3behttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6PZVLICZUJMXOGWOUWSBAEGIVTF6Y6V3/vendor-advisoryx_refsource_FEDORA
www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2022.htmlx_refsource_MISC
security.netapp.comhttps://security.netapp.com/advisory/ntap-20211118-0003/x_refsource_CONFIRM
www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.htmlx_refsource_MISC
security.gentoo.orgGLSA-202209-20https://security.gentoo.org/glsa/202209-20vendor-advisoryx_refsource_GENTOO

01 Record index

CVE-2021-21703

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-21703

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References