CVE-2024-29857Network attack vector

CPU exhaustion via unbounded F2m field size

Published May 9, 2024 · Updated Feb 13, 2025

Resource consumption in affected Bouncy Castle Java, Java FIPS, and C# .NET releases allows attackers to interrupt applications. The ECCurve F2m constructor accepts an attacker-controlled m field size without a maximum bound, causing excessive work when a crafted X.509 public key is extracted. Exposure is limited to applications that accept explicit F2m parameter sets or invoke the constructor from imported code; named-curve-only paths, including TLS, are not affected.

CVSS severity5.3
Medium
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource consumption in affected Bouncy Castle Java, Java FIPS, and C# .NET releases allows attackers to interrupt applications. The ECCurve F2m constructor accepts an attacker-controlled m field size without a maximum bound, causing excessive work when a crafted X.509 public key is extracted. Exposure is limited to applications that accept explicit F2m parameter sets or invoke the constructor from imported code; named-curve-only paths, including TLS, are not affected.

The record

CVE
CVE-2024-29857
Published
May 9, 2024
Updated
Feb 13, 2025
Vendor
Legion of the Bouncy Castle Inc.
Product
Bouncy Castle Java
Classifications
CWE-400, CWE-125, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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 <=1.77

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Legion of the Bouncy Castle Inc. · Bouncy Castle Javaversion=0 <=1.77
Legion of the Bouncy Castle Inc. · Bouncy Castle Java FIPSversion=0 <=1.0.2.4
Legion of the Bouncy Castle Inc. · Bouncy Castle C# .NETversion=0 <=2.3.0

Published CVSS scores

5.3GitHub Advisory DatabaseCVSS: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-400Uncontrolled Resource Consumption
CWE-125Out-of-bounds Read
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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