CVE-2025-13470Network attack vector

Data decryption via zeroed PKESK session keys

Published Nov 21, 2025 · Updated Nov 21, 2025

Insufficiently random session keys in Ribose RNP 0.18.0 allow remote attackers to decrypt data encrypted with public keys. The encrypted_build_skesk() refactoring leaves the PKESK session-key buffer zeroed instead of filling it with cryptographically random bytes. Only public-key encryption produced by 0.18.0 is exposed; passphrase-based SKESK encryption is unaffected, and possession of ciphertext permits decryption without the private key.

CVSS severity7.5
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficiently random session keys in Ribose RNP 0.18.0 allow remote attackers to decrypt data encrypted with public keys. The encrypted_build_skesk() refactoring leaves the PKESK session-key buffer zeroed instead of filling it with cryptographically random bytes. Only public-key encryption produced by 0.18.0 is exposed; passphrase-based SKESK encryption is unaffected, and possession of ciphertext permits decryption without the private key.

The record

CVE
CVE-2025-13470
Published
Nov 21, 2025
Updated
Nov 21, 2025
Vendor
Ribose
Product
RNP
Classifications
CWE-330, T1140
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 21, 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=0.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ribose · RNPversion=0.18.0

Published CVSS scores

7.7Ribose LimitedCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
7.5Ribose LimitedCVSS:3.1/AV:N/AC:L/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-330Use of Insufficiently Random Values
T1140Deobfuscate/Decode Files or Information

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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