🛡️ CVE-2024-2511

🟡 CVSS 5.9 — Medium ✅ No Known Exploit CWE-1325 NVD
5.9
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Issue summary: Some non-default TLS server configurations can cause unbounded

memory growth when processing TLSv1.3 sessions

Impact summary: An attacker may exploit certain server configurations to trigger

unbounded memory growth that would lead to a Denial of Service

This problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is

being used (but not if early_data support is also configured and the default

anti-replay protection is in use). In this case, under certain conditions, the

session cache can get into an incorrect state and it will fail to flush properly

as it fills. The session cache will continue to grow in an unbounded manner. A

malicious client could deliberately create the scenario for this failure to

force a Denial of Service. It may also happen by accident in normal operation.

This issue only affects TLS servers supporting TLSv1.3. It does not affect TLS

clients.

The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL

1.0.2 is also not affected by this issue.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2024-2511 is classified as CWE-1325: Improperly Controlled Sequential Memory Allocation. The product manages a group of objects or resources and performs a separate memory allocation for each object, but it does not properly limit the total amount of memory that is consumed by all of the combined objects.

Affected software

CVE-2024-2511 is recorded against 1 package.

  • unknown

Timeline and source

Published on 8 April 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com
github.com
github.openssl.org
www.openssl.org
www.openwall.com
github.com
github.com
github.com
github.openssl.org
lists.debian.org
lists.debian.org
security.netapp.com
www.openssl.org
cert-portal.siemens.com

CVE-2024-2511 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 5.9
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-1325
Public Exploit ✅ No
Source NVD
Published 2024-04-08
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

References

Similar Threats

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