CVE-2024-34703Network attack vector

Service interruption via oversized curve primality checks

Published Jun 30, 2024 · Updated Jan 30, 2026

Resource exhaustion in Randombit Botan before 2.19.4 and 3.0.0-alpha0 through 3.2.0 allows remote attackers to interrupt service. EC_Group::BER_decode_EC_group passed an unbounded explicit-curve prime to probable-prime testing instead of first enforcing a size limit. Any application that parses an attacker-supplied ECDSA X.509 certificate with explicit curve parameters can spend excessive CPU time checking a very large prime, delaying or halting its service.

CVSS severity7.5
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Randombit Botan before 2.19.4 and 3.0.0-alpha0 through 3.2.0 allows remote attackers to interrupt service. EC_Group::BER_decode_EC_group passed an unbounded explicit-curve prime to probable-prime testing instead of first enforcing a size limit. Any application that parses an attacker-supplied ECDSA X.509 certificate with explicit curve parameters can spend excessive CPU time checking a very large prime, delaying or halting its service.

The record

CVE
CVE-2024-34703
Published
Jun 30, 2024
Updated
Jan 30, 2026
Vendor
Botan Project
Product
Botan
Classifications
CWE-405, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2024CVE publishedPublication date reported by the CVE source.
  2. Jan 30, 2026Record 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 <2.19.4
  2. Affected versionversion=< 2.19.4
  3. Affected versionversion=>= 3.0.0-alpha0, < 3.3.0
  4. Affected versionversion=3.30 <3.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Botan Project · Botanversion=0 <2.19.4; version=< 2.19.4; version=>= 3.0.0-alpha0, < 3.3.0; version=3.30 <3.3.1

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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-405Asymmetric Resource Consumption (Amplification)
T1499.004Application or System Exploitation

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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