Security readout for executives and security teams
CVE-2006-1991 is an old PHP flaw that can crash affected PHP 5.1.2 processes when substr_compare receives an out-of-bounds offset. The main business risk is service interruption, not data theft. Exposure depends on whether legacy PHP code lets untrusted input influence that function argument. Likely exposure is limited to legacy PHP 5.1.2 deployments or vendor-packaged PHP branches covered by the listed 2006 advisories. Risk is higher for internet-facing PHP applications where request data can reach substr_compare offset handling. Treat this as a legacy availability risk. It is not evidence of current compromise, but exposed PHP 5.1.2 systems should be patched or retired because unsupported web runtimes create broader operational risk. Mitigation focus: Inventory systems running PHP 5.1.2 or affected legacy vendor packages.; Apply PHP updates from the relevant vendor advisory or supported distribution channel.; Retire or isolate unsupported legacy PHP environments that cannot be patched..
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
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CVE-2006-1991 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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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
- php-substrcompare-length-dos(26003)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
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