CVE-2026-101980

criticalpriority · track · 39EPSS 0.005 · 41 %ileFRNLRUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.47% (41st) EPSS

CVSS 9.8 · critical

Is it mine?

9 products

Check your exposure

Who says so?

3 sources

fstec_bdu · ncsc_nl · certfr

EPSS · scored 2026-10-28

An Integer Underflow vulnerability in the kernel of Juniper Networks Junos OS with Extended Echo configured allows an unauthenticated, network-based attacker to cause a denial of service by a kernel crash.

cvss

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

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.1–9.8

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · sirt@juniper.net USexploitability 3.9 · impact 5.9

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · NCSC-NL NL

v4.09.3criticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · sirt@juniper.net US

v4.08.1highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-191USCWE-191USCWE-191US

affected products (9)

Products and version ranges known to be affected.

Juniper Networks Inc. Junos OS≤ 23.2R2-S7.7fstec_bduRU
Juniper Networks Inc. Junos OS23.4 → 23.4R2-S8.13fstec_bduRU
Juniper Networks Inc. Junos OS24.2 → 24.2R2-S5.5fstec_bduRU
Juniper Networks Inc. Junos OS24.4 → 24.4R2-S5fstec_bduRU
Juniper Networks Inc. Junos OS25.2 → 25.2R2-S2fstec_bduRU
Juniper Networks Inc. Junos OS25.4 → 25.4R1-S3fstec_bduRU
Juniper Networks Inc. Junos OS26.2 → 26.2R1-S2fstec_bduRU
Juniper Junos OS≤ vers:unknown/*ncsc_nlNL
Juniper Junos OS Evolved≤ vers:unknown/*ncsc_nlNL

advisories (2)

Vendor and ecosystem advisories describing this.

NCSC-2026-0430Kwetsbaarheden verholpen in Juniper Networks Junos OSNL2026-10-16csaf · ncsc_nlNL
Juniper heeft meerdere kwetsbaarheden verholpen in Junos OS.
CERTFR-2026-AVI-1322Multiples vulnérabilités dans les produits Juniper NetworksFrançais2026-10-15vendor · certfrFR

also known as (2)

Other names and identifiers for this entity.

BDU:2026-17388 fstec_bdu
JSA ID:112188fstec_bdu

sources

Which sources assert this record, and when.

fstec_bdu ncsc_nl certfr NVD CVE.org MITRE

published 2026-10-14modified 2026-10-23

references (1) nvd

External citations — patches, advisories, analysis.

https://supportportal.juniper.net/JSA112188

scry

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