CVE-2023-29479Network attack vector

Unauthenticated hang via malformed OpenPGP parsing

Published Apr 24, 2023 · Updated Nov 21, 2025

Uncontrolled resource consumption in Ribose RNP 0.16.1 through 0.16.2 allows remote attackers to cause a service hang via malformed OpenPGP messages. Certain malformed PKESK and SKESK packets trigger incorrect parsing that leaves the library hung. No credentials or user interaction are required; applications such as Thunderbird can become unresponsive while processing the message.

CVSS severity5.3
Medium
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Ribose RNP 0.16.1 through 0.16.2 allows remote attackers to cause a service hang via malformed OpenPGP messages. Certain malformed PKESK and SKESK packets trigger incorrect parsing that leaves the library hung. No credentials or user interaction are required; applications such as Thunderbird can become unresponsive while processing the message.

The record

CVE
CVE-2023-29479
Published
Apr 24, 2023
Updated
Nov 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, CWE-400, CAPEC-607, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2023CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
CAPEC-607Obstruction
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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