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CVE-2024-2511

MEDIUM
Published 2024-04-08T13:51:12.349Z
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CVSS Score

V3.1
5.9
/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.021
probability
of exploitation in the wild

There is a 2.1% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.832
Higher than 83.2% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
HIGH

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.

Available Exploits

No exploits available for this CVE.

Related News

Openssl Vulnerabilities found in Ubuntu 22.04

As a result of VA, we found multiple openssl vulnerabilities, so I updated openssl from 3.0.2 to 3.0.16, but the vulnerabilities still persist Vulnerabilities Lists CVE-2024-5535, CVE-2024-4603, CVE-2024-2511, CVE-2024-4741 etc.. Can anyone help me to resolve…

Askubuntu.com 2025-03-05 11:07
Read More

Affected Products

OpenSSL

OpenSSL

Affected Versions:

3.2.0 3.1.0 3.0.0 1.1.1

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed MODERATE

GHSA-299c-jvhc-gxj8

Advisory Details

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.

CVSS Scoring

CVSS Score

5.0

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2024-2511
WEB https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce
WEB https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d
WEB https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08
WEB https://github.openssl.org/openssl/extended-releases/commit/5f8d25770ae6437db119dfc951e207271a326640
WEB https://security.netapp.com/advisory/ntap-20240503-0013
WEB https://www.openssl.org/news/secadv/20240408.txt
WEB http://www.openwall.com/lists/oss-security/2024/04/08/5

Advisory provided by GitHub Security Advisory Database. Published: April 8, 2024, Modified: March 28, 2025

References

https://www.openssl.org/news/secadv/20240408.txt
https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08
https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce
https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d
https://github.openssl.org/openssl/extended-releases/commit/5f8d25770ae6437db119dfc951e207271a326640
Published: 2024-04-08T13:51:12.349Z
Last Modified: 2025-03-28T19:21:08.630Z
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