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CVE-2026-101949

Junos OS and Junos OS Evolved: In a scenario with VPN-flowspec and BMP monitoring a specific BGP update causes an rpd crash

No known exploitation. EPSS puts it in the 38th percentile. Fixed versions are out.

CVSS 3.17.5HighEPSS percentile38th0.4% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix2 products8 fixed builds listed below

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Juniper Networks Junos OSAffected: < 23.2R2-S7.7Upgrade to: 23.2R2-S7.7Affected: ≥ 23.4, < 23.4R2-S8.13Upgrade to: 23.4R2-S8.13Affected: ≥ 24.2, < 24.2R2-S5.5Upgrade to: 24.2R2-S5.5Affected: ≥ 24.4, < 24.4R2-S5Upgrade to: 24.4R2-S5 + 3 more branchesStated by: CVE record
  • Juniper Networks Junos OS EvolvedAffected: < 23.2R2-S7.7-EVOUpgrade to: 23.2R2-S7.7-EVOAffected: ≥ 23.4, < 23.4R2-S8.11-EVOUpgrade to: 23.4R2-S8.11-EVOAffected: ≥ 24.2, < 24.2R2-S5.6-EVOUpgrade to: 24.2R2-S5.6-EVOAffected: ≥ 24.4, < 24.4R2-S5-EVOUpgrade to: 24.4R2-S5-EVO + 6 more branchesStated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

A NULL Pointer Dereference vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated remote BGP neighbor to cause a denial of service via a VPN-flowspec BGP update if it is readvertised and BMP post-policy RIB-out monitoring is configured.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS38th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.4% chance of exploitation activity in the next 30 days, which ranks it in the 38th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

13 events over 8 days, from the signal feeds we watch.

  1. OpenVAS check added
  2. Patch availableworkaround available, record updated
  3. Patch availablepatch available, workaround available, workaround available, published, weakness classified, att&ck mapped, record updated, record updated

Affected products

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Scored 7.5 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality NoneNo confidentiality impact
  • Integrity NoneNo integrity impact
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

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We'll flag the next CVE, public exploit or patch for Junos OS, not every advisory.