CVE-2024-2511

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2024-04-08. NVD baseline CVSS 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
5.9
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 54%
CISA-KEV: Not listedEPSS: 54%CVSS: 5.9Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
5.9
EG Score
5.9(medium)
EPSS
98.9%
KEV
Not listed

Published

April 8, 2024

Last Modified

May 12, 2026

References (20)

Vendor Advisories for CVE-2024-2511(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopenssl (3.0.13-0ubuntu3.2) @ noble2026-05-22ubuntu
ubuntuqemu-efi-riscv64 (2025.02-3ubuntu2.2) @ plucky2026-05-22ubuntu
redhatopenssl-1:3.2.2-6.el9_52024-11-12redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 36× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-07-19 02:28 UTCEPSS rescore
  2. 2026-07-19 02:28 UTCEPSS rescore
  3. 2026-07-18 10:03 UTCEPSS rescore
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  15. 2026-07-11 07:52 UTCOSV refresh
  16. 2026-07-09 19:09 UTCEPSS rescore
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  1. 2026-06-25 13:49 UTCEPSS rescore
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  5. 2026-06-23 21:32 UTCEPSS rescore
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  7. 2026-06-22 14:26 UTCOSV refresh
  8. 2026-06-21 01:58 UTCEPSS rescore
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  10. 2026-06-19 19:25 UTCEPSS rescore
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  22. 2026-06-11 13:59 UTCEPSS rescore
  23. 2026-06-10 22:17 UTCEPSS rescore
  24. 2026-06-10 13:21 UTCEPSS rescore
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  26. 2026-06-08 14:16 UTCEPSS rescore
  27. 2026-06-07 15:24 UTCEPSS rescore
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  35. 2026-06-05 00:09 UTCOSV refresh
  36. 2026-06-04 13:11 UTCEPSS rescore
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  41. 2026-06-01 13:51 UTCEPSS rescore
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  60. 2026-05-22 21:16 UTCEPSS rescore
  61. 2026-05-22 03:29 UTCEG score recompute
  62. 2026-05-22 03:29 UTCVendor advisory
  63. 2026-05-22 03:29 UTCGHSA enrichment
  64. 2026-05-21 22:42 UTCEPSS rescore
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  75. 2026-05-18 21:30 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2024-2511?
CVE-2024-2511 is a medium vulnerability published on April 8, 2024. 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…
When was CVE-2024-2511 disclosed?
CVE-2024-2511 was first published in the National Vulnerability Database on April 8, 2024, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-2511 actively exploited?
CVE-2024-2511 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-2511?
CVE-2024-2511 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2024-2511?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-2511, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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