CVE-2024-52811

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 85% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.2Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The ngtcp2 project is an effort to implement IETF QUIC protocol in C. In affected versions acks are not validated before being written to the qlog leading to a buffer overflow. In ngtcp2_conn::conn_recv_pkt for an ACK, there was new logic that got added to skip conn_recv_ack if an ack has already been processed in the payload. However, this causes us to also skip ngtcp2_pkt_validate_ack. The ack which was skipped still got written to qlog. The bug occurs in ngtcp2_qlog::write_ack_frame. It is now possible to reach this code with an invalid ack, suppose largest_ack=0 and first_ack_range=15. Subtracting largest_ack - first_ack_range will lead to an integer underflow which is 20 chars long. However, the ngtcp2 qlog code assumes the number written is a signed integer and only accounts for 19 characters of overhead (see NGTCP2_QLOG_ACK_FRAME_RANGE_OVERHEAD). Therefore, we overwrite the buffer causing a heap overflow. This is high priority and could potentially impact many users if they enable qlog. qlog is disabled by default. Due to its overhead, it is most likely used for debugging purpose, but the actual use is unknown. ngtcp2 v1.9.1 fixes the bug and users are advised to upgrade. Users unable to upgrade should not turn on qlog.

CVSS v3
8.2
EG Score
8.2(medium)
EPSS
52.8%
KEV
Not listed

Published

November 25, 2024

Last Modified

April 15, 2026

References (3)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 42× 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 114 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2024-52811?
CVE-2024-52811 is a high vulnerability published on November 25, 2024. The ngtcp2 project is an effort to implement IETF QUIC protocol in C. In affected versions acks are not validated before being written to the qlog leading to a buffer overflow. In ngtcp2conn::connrecvpkt for an ACK, there was new logic that got added to skip connrecvack if an ack has already been…
When was CVE-2024-52811 disclosed?
CVE-2024-52811 was first published in the National Vulnerability Database on November 25, 2024, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-52811 actively exploited?
CVE-2024-52811 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-52811?
CVE-2024-52811 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2024-52811?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-52811, 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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