CVE-2019-8460
CVE-2019-8460 is a high-severity vulnerability in Openbsd with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1049.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 2% (80th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-1049
- Affected product: Openbsd
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2019-8460?
- 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.
- How severe is CVE-2019-8460?
- CVE-2019-8460 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2019-8460 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-8460?
- CVE-2019-8460 affects Openbsd. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2019-8460?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2019-8460 published?
- CVE-2019-8460 was published on 2019-08-26 and last updated on 2026-06-17.
References
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig
- https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f
- https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/
- https://security.netapp.com/advisory/ntap-20190905-0001/
- https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03
Affected products (1)
- cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*
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