Security readout for executives and security teams
Plain-English summary
This is an old PHPIDS vulnerability where input-filtering rules could be bypassed. The public CVE says attackers may add PHP sequences to a file through unspecified vectors. Business urgency depends on whether any legacy, internet-facing application still relies on PHPIDS before version 0.7.
Executive priority
Prioritize as a legacy exposure cleanup item. Escalate if PHPIDS before 0.7 protects public applications or file-write paths, because the public record describes remote bypass potential but lacks severity scoring.
Technical view
PHPIDS before 0.7 improperly implemented ReDoS filters. According to the CVE description, remote attackers could bypass rulesets and add PHP sequences to a file. The available bundle does not provide CVSS, CWE mapping, exact CPEs, proof of exploitation, or detailed remediation guidance.
Likely exposure
Likely limited to legacy PHP applications using PHPIDS before 0.7, especially where PHPIDS is part of request filtering or file-writing workflows. The provided affected-product metadata is incomplete.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. The attack vector is described only as remote and unspecified, so exposure assessment should focus on inventory and version confirmation rather than exploit assumptions.
Researcher notes
Evidence is sparse. The key uncertainty is the unspecified vector and incomplete affected-product metadata. Treat the CVE text and original advisory as primary sources, and avoid assuming exploitability beyond PHPIDS before 0.7 without local validation.
Mitigation direction
- Inventory applications and libraries for PHPIDS usage.
- Flag any PHPIDS version before 0.7 for remediation review.
- Check the PHPIDS advisory or maintainer guidance before applying fixes.
- Remove or replace unsupported PHPIDS deployments where practical.
- Review file-write paths protected only by PHPIDS filtering.
Validation and detection
- Confirm deployed PHPIDS versions from application dependency records.
- Search code and configuration for PHPIDS integration points.
- Identify internet-facing routes using PHPIDS filtering.
- Review logs for unexpected PHP sequence writes or filter bypass indicators.
- Document whether PHPIDS is still active or only unused legacy code.
Public sources used
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.
CVE-2011-5021 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://sitewat.ch/Advisory/View/7CVE reference · x_refsource_MISC
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.