CVE-2025-1828Network attack vector

Predictable cryptographic output via insecure rand fallback

Published Mar 10, 2025 · Updated Sep 9, 2025

Weak random-number generation in Perl Crypt::Random 1.05 through 1.55 allows attackers to predict cryptographic output. Crypt::Random::Provider::rand passes byte-generation requests to Perl's internal rand() function instead of an operating-system entropy source. The fallback is selected when no provider is specified and neither /dev/urandom nor EGD is available; Windows Perl encounters that state by default.

CVSS severity8.8
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak random-number generation in Perl Crypt::Random 1.05 through 1.55 allows attackers to predict cryptographic output. Crypt::Random::Provider::rand passes byte-generation requests to Perl's internal rand() function instead of an operating-system entropy source. The fallback is selected when no provider is specified and neither /dev/urandom nor EGD is available; Windows Perl encounters that state by default.

The record

CVE
CVE-2025-1828
Published
Mar 10, 2025
Updated
Sep 9, 2025
Vendor
Perl
Product
Crypt::Random
Classifications
CWE-338, CWE-331
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.05 <1.56

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Perl · Crypt::Randomversion=1.05 <1.56

Published CVSS scores

8.8CISACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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

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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