CVE-2019-8460

HIGHNVD 7.57.5—

7.5

OpenBSD kernel version <= 6.5 can be forced to create long chains of TCP SACK holes that causes very expensive calls to tcp_sack_option() for every incoming SACK packet which can lead to a denial of service.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 72.0%
KEV: Not listed

Published

August 26, 2019

Last Modified

November 21, 2024

References (10)

cve@checkpointhttps://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig
cve@checkpointhttps://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f
cve@checkpointhttps://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/
cve@checkpointhttps://security.netapp.com/advisory/ntap-20190905-0001/
cve@checkpointhttps://us-cert.cisa.gov/ics/advisories/icsa-19-253-03
af854a3a-2127-422b-91ae-364da2661108https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig
af854a3a-2127-422b-91ae-364da2661108https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f
af854a3a-2127-422b-91ae-364da2661108https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20190905-0001/
af854a3a-2127-422b-91ae-364da2661108https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03

Weakness Classification(1)

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

CWE-1049

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 15:13 UTCEG score recompute
2026-05-27 15:13 UTCGHSA enrichment
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:47 UTCepss_batch

Frequently asked(5)

What is CVE-2019-8460?

CVE-2019-8460 is a high vulnerability published on August 26, 2019. OpenBSD kernel version <= 6.5 can be forced to create long chains of TCP SACK holes that causes very expensive calls to tcpsackoption() for every incoming SACK packet which can lead to a denial of service.

When was CVE-2019-8460 disclosed?

CVE-2019-8460 was first published in the National Vulnerability Database on August 26, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2019-8460 actively exploited?

CVE-2019-8460 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 72.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-8460?

CVE-2019-8460 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2019-8460?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-8460, 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.

Dependency Blast Radius

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CVE-2019-8460

📅 Published

🔄 Last Modified

🔗 References (10)