CVE-2024-34447

Publication date 3 May 2024

Last updated 18 March 2026

Ubuntu priority

Cvss 3 Severity Score

Description

An issue was discovered in the Bouncy Castle Crypto Package For Java before BC TLS Java 1.0.19 (ships with BC Java 1.78, BC Java (LTS) 2.73.6) and before BC FIPS TLS Java 1.0.19. When endpoint identification is enabled in the BCJSSE and an SSL socket is created without an explicit hostname (as happens with HttpsURLConnection), hostname verification could be performed against a DNS-resolved IP address in some situations, opening up a possibility of DNS poisoning.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
bouncycastle	25.10 questing	Not affected
	25.04 plucky	Ignored end of life, was needs-triage
	24.10 oracular	Ignored end of life, was needs-triage
	24.04 LTS noble	Fixed 1.77-1ubuntu0.1~esm1
	23.10 mantic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Fixed 1.68-5ubuntu0.1~esm1
	20.04 LTS focal	Fixed 1.61-1ubuntu0.1~esm1
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected

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Notes

hlibk

Vulnerable code introduced in 1.61.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
bouncycastle	Upstream: c47f644

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-8108-1
Bouncy Castle vulnerabilities
18 March 2026