Security readout for executives and security teams
This flaw affects vulnerable PHP-FPM deployments and can let someone who already has low-level local access become root. It is not a remote website compromise by itself, but it raises the impact of any foothold on a server running affected PHP versions. Exposure is most likely on servers running PHP-FPM with an affected PHP version and the common model of a root master process with lower-privileged worker processes. Internet-facing PHP sites matter if attackers can first gain local code execution or a low-privileged account. Treat this as a high-priority server hardening and patching issue, especially on shared hosting, CMS, or application servers where an attacker might gain a low-privileged foothold. It is not confirmed as actively exploited in the supplied sources. Mitigation focus: Upgrade PHP beyond affected versions through trusted vendor packages.; Prioritize PHP-FPM hosts that allow user uploads, plugins, or shared hosting access.; Apply relevant Debian, Fedora, Gentoo, Oracle, or NetApp vendor updates where applicable..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-21703 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H1.16Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://bugs.php.net/bug.php?id=81026CVE reference · x_refsource_MISC
- DSA-4992CVE reference · vendor-advisory, x_refsource_DEBIAN
- DSA-4993CVE reference · vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20211027 [SECURITY] [DLA 2794-1] php7.0 security updateCVE reference · mailing-list, x_refsource_MLIST
- FEDORA-2021-9f68f5f752CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-4140b54de2CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-02d218c3beCVE reference · vendor-advisory, x_refsource_FEDORA
- https://www.oracle.com/security-alerts/cpujan2022.htmlCVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20211118-0003/CVE reference · x_refsource_CONFIRM
- https://www.oracle.com/security-alerts/cpuapr2022.htmlCVE reference · x_refsource_MISC
- GLSA-202209-20CVE reference · vendor-advisory, x_refsource_GENTOO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.