CVE-2024-8508

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2024-10-03. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
—
EPSS
52.8%
KEV
Not listed

Published

October 3, 2024

Last Modified

December 17, 2024

References (3)

Vendor Advisories for CVE-2024-8508(7)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuunbound-host (1.5.8-1ubuntu1.1+esm2) @ xenial2026-05-23ubuntu
redhatunbound-0:1.16.2-18.el9_62025-05-27redhat
redhatunbound-0:1.20.0-10.el10_02025-05-20redhat
redhatrhcos-417.94.202502051822-02025-02-11redhat
redhatunbound-0:1.16.2-5.8.el8_102025-01-30redhat
redhatrhcos-416.94.202501030250-02025-01-15redhat
redhatunbound-0:1.16.2-8.el9_4.12024-12-17redhat
redhatunbound-0:1.16.2-8.el9_5.12024-12-17redhat

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(2)

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

Additional Vendor Advisories

(2)

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 / 46× 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 105 total refreshes for this CVE.

  1. 2026-07-22 14:07 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2024-8508?
CVE-2024-8508 is a medium vulnerability published on October 3, 2024. NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to…
When was CVE-2024-8508 disclosed?
CVE-2024-8508 was first published in the National Vulnerability Database on October 3, 2024, with the most recent update on December 17, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-8508 actively exploited?
CVE-2024-8508 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-2024-8508?
CVE-2024-8508 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2024-8508?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-8508, 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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