Exploitation status
KEV status unavailable
The KEV source did not return a conclusive status.
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Indicator investigation
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Indicator
Type cve · source NVD CVE
MEDIUM SEVERITY (CVSS 6.3)
Vulnerability investigation
CISA KEV status could not be verified from the available evidence. NVD rates the technical severity medium at CVSS 6.3. These are public vulnerability signals, not proof that a specific environment runs an affected version.
Exploitation status
KEV status unavailable
The KEV source did not return a conclusive status.
30-day exploitation likelihood
Unavailable
FIRST EPSS did not return a score.
Technical severity
6.3 · medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Affected surface
Product applicability incomplete
No structured product mapping is available.
Weakness class
CWE-208, CWE-385
CWE describes the weakness category, not whether a deployed product is reachable or exploitable.
Corpus evidence
1 connectors · 2 citations
No related report text is available in the local corpus.
Findings stay bounded to named sources and observable infrastructure.
phpseclib is a PHP secure communications library. Prior to 3.0.57 and 4.0.1, pure-PHP X25519 scalar multiplication in phpseclib/Math/PrimeField/Integer.php performs data-dependent conditional modular reductions in add() and subtract(). During the Montgomery ladder in phpseclib/Crypt/EC/BaseCurves/Montgomery.php, the reduction behavior of each step depends on the secret scalar prefix, creating per-step timing and libgmp call-count observations that can reveal a reused 251-bit clamped private scalar. The phpseclib/Crypt/EC/Formats/Keys/MontgomeryPrivate.php derivation path invokes the pure-PHP multiplication without a native-engine check, while phpseclib/Crypt/EC/Formats/Keys/PKCS8.php reaches it when ext-sodium is unavailable. Exploitation requires a reused or long-lived X25519 private key, knowledge of the corresponding public key, execution of the pure-PHP path, and a local observer capable of resolving individual ladder steps or libgmp entry-point calls. Ephemeral X25519 keys, including phpseclib's normal SSH exchange path, are not affected. Recovery of the scalar permanently compromises operations that reuse that key. This issue is fixed in versions 3.0.57 and 4.0.1.
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Investigation status
Checking for newly completed evidence
NIST NVD
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CISA KEV
Known-exploitation catalog check is pending
FIRST EPSS
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Reports
Report links are still being resolved
Relationships
Product and vulnerability relationships are still being prepared
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