CVE-2019-8460

mediumpriority · track · 31EPSS 0.023 · 83 %ileDEEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
2.25% (83rd) EPSS
CVSS 5 · medium
Is it mine?
114 products
Check your exposure
Who says so?
7 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-22

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.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

7.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6
v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US
v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:Csecondary · Siemens ProductCERT DE
v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1049USCWE-1049USCWE-20USCWE-400US
04

affected products (114)

Products and version ranges known to be affected.

showing 20 of 114
05

advisories (3)

Vendor and ecosystem advisories describing this.

  • SSA-462066SSA-462066: Vulnerability known as TCP SACK PANIC in Industrial Products2019-09-10csaf · siemens_psirtDE

    Multiple industrial products are affected by a vulnerability in the kernel known as TCP SACK PANIC. The vulnerability could allow a remote attacker to cause a denial of service condition. Siemens has released updates for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where updates are not, or not yet available.

  • WID-SEC-W-2023-0914OpenBSD: Schwachstelle ermöglicht Denial of ServiceDeutsch2019-08-26csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann eine Schwachstelle in OpenBSD ausnutzen, um einen Denial of Service Angriff durchzuführen.

  • ICSA-19-253-03ICSA-19-253-03_Siemens Industrial Products (Update P)2019-09-10icsa · cisa_csaf_otUS

    Successful exploitation of these vulnerabilities could cause denial-of-service condition.

06

also known as (4)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundcisa_csaf_otnvdsiemens_psirtNVDCVE.orgMITRE
published 2019-08-26modified 2026-06-17
08

references (17)

External citations — patches, advisories, analysis.

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