CVE-2024-58040Network attack vector

Encryption padding prediction via Perl rand

Published Sep 29, 2025 · Updated Sep 29, 2025

Insufficient entropy in Vipin Singh Crypt::RandomEncryption 0.01 allows remote attackers to predict encryption padding. The _random() routine selects every inserted alphanumeric character with Perl's predictable rand(), and encrypt() interleaves those characters with RC4 output before a second RC4 pass. No privileges or user interaction are required when a consuming application exposes ciphertext remotely; the predictable padding weakens the module's added randomization.

CVSS severity9.1
Critical
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient entropy in Vipin Singh Crypt::RandomEncryption 0.01 allows remote attackers to predict encryption padding. The _random() routine selects every inserted alphanumeric character with Perl's predictable rand(), and encrypt() interleaves those characters with RC4 output before a second RC4 pass. No privileges or user interaction are required when a consuming application exposes ciphertext remotely; the predictable padding weakens the module's added randomization.

The record

CVE
CVE-2024-58040
Published
Sep 29, 2025
Updated
Sep 29, 2025
Vendor
Vipin Singh
Product
Crypt::RandomEncryption
Classifications
CWE-331, CWE-338
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 29, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=0.01 <=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vipin Singh · Crypt::RandomEncryptionversion=0.01 <=*

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-331Insufficient Entropy
CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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