CVE-2025-62710Network attack vector

Protected-data disclosure via predictable encryption key

Published Oct 22, 2025 · Updated Oct 24, 2025

Cryptographic weakness in Sakai 23 before 23.5 and Sakai 25 before 25.0 allows remote attackers to decrypt protected data. EncryptionUtilityServiceImpl passes a RandomStringUtils value backed by java.util.Random to AES256TextEncryptor as serverSecretKey, enabling startup-time seed guesses. Exploitation requires obtained ciphertext and an approximate PRNG seed, and it exposes only data protected by this service.

CVSS severity5.9
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cryptographic weakness in Sakai 23 before 23.5 and Sakai 25 before 25.0 allows remote attackers to decrypt protected data. EncryptionUtilityServiceImpl passes a RandomStringUtils value backed by java.util.Random to AES256TextEncryptor as serverSecretKey, enabling startup-time seed guesses. Exploitation requires obtained ciphertext and an approximate PRNG seed, and it exposes only data protected by this service.

The record

CVE
CVE-2025-62710
Published
Oct 22, 2025
Updated
Oct 24, 2025
Vendor
Sakai
Product
Sakai
Classifications
CWE-338, CWE-337
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 24, 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=< 23.5
  2. Affected versionversion=< 25.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sakai · Sakaiversion=< 23.5; version=< 25.0

Published CVSS scores

5.9NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
5.9GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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-337Predictable Seed in 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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