HIGH
CVE-2019-8460
CWE-1049Published: August 26, 2019· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official 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.
Technical Analysis
CVE-2019-8460 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
openbsd1 product(s)
openbsd
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (10)
→
https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sigExploit · Vendor Advisory
→
https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906fPatch · Third Party Advisory
→
https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/Exploit · Patch · Press/Media Coverage · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20190905-0001/Third Party Advisory
→
https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sigExploit · Vendor Advisory
→
https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906fPatch · Third Party Advisory
→
https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/Exploit · Patch · Press/Media Coverage · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20190905-0001/Third Party Advisory
Quick Facts
CVE IDCVE-2019-8460
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-1049
CISA KEVNo
Affected1 vendor(s)
PublishedAug 26, 2019
Related CVEs (CWE-1049)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-8460 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.