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Back to active CVEs
High · CVSS 8.6CVE-2026-101927

Junos OS and Junos OS Evolved: An unprivileged local attacker causes denial of service or privilege escalationCVE-2026-101927

Answer in brief

CVE-2026-101927 records a High severity (CVSS 8.6) vulnerability in Junos OS and Junos OS Evolved: An unprivileged local attacker causes denial of service or privilege escalation. The current sources do not mark it as known exploited. The current feed maps Juniper Networks/Junos OS (generic), Juniper Networks/Junos OS Evolved (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 14, 2026Updated Oct 14, 2026Source checked Oct 14, 2026First seen by HOL Oct 14, 2026Material review Oct 14, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.6
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Juniper Networks/Junos OS (generic), Juniper Networks/Junos OS Evolved (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Juniper Networks/Junos OSgeneric>=0 <23.2R2-S7.7 || >=23.4 <23.4R2-S8.13 || >=24.2 <24.2R2-S5.5 || >=24.4 <24.4R2-S5 || >=25.2 <25.2R2-S2 || >=25.4 <25.4R1-S3 || >=26.2 <26.2R1-S223.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 26.2R1-S2
Juniper Networks/Junos OS Evolvedgeneric>=0 <23.2R2-S7.7-EVO || >=23.4 <23.4R2-S8.11-EVO || >=24.2 <24.2R2-S5.6-EVO || >=24.4 <24.4R2-S5-EVO || >=25.2 <25.2R2-S2-EVO || >=25.4 <25.4R1-S3-EVO || >=26.2 <26.2R1-S2-EVO || 23.4X100 || >=25.2X100 <25.2X100-D35-EVO || >=25.4X300 <25.4X300-D40-EVO23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.4R1-S3-EVO, 26.2R1-S2-EVO, 25.2X100-D35-EVO, 25.4X300-D40-EVO

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Juniper Networks/Junos OS, Juniper Networks/Junos OS Evolved.
  2. 2Review the reported fix. Source-reported solution: The following software releases have been updated to resolve this specific issue: Junos OS: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1, and all subsequent releases. Junos OS Evolved: 23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.2X100-D35-EVO, 25.4R1-S3-EVO, 25.4R2-EVO, 25.4X300-D40-EVO, 26.2R1-S2-EVO, 26.2R2-EVO, 26.4R1-EVO, and all subsequent releases. Note: For Junos OS releases 23.2, 23.4, and 24.2, and Junos OS Evolved releases 23.2-EVO, 23.4-EVO, and 24.2-EVO, specific respins have been referenced. Previously published versions of these releases have been rebuilt to resolve the security vulnerabilities identified in this advisory.

Evidence timeline and material changes

  1. Published upstream

    Oct 14, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 14, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 14, 2026

Sources and claim methodology

  • Source referencesupportportal.juniper.net
Upstream source description

A Heap-based Buffer Overflow vulnerability in eventd of Juniper Networks Junos OS and Junos OS Evolved on all platforms allows an unprivileged local attacker to cause a denial of service (DoS) or achieve privilege escalation to root via crafted IPC event messages.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Junos OS and Junos OS Evolved: In a scenario with VPN-flowspec and BMP monitoring a specific BGP update causes an rpd crashSame juniper networks/junos os package
  • Junos OS and Junos OS Evolved: A specific BGP ISO-VPN update causes an rpd crash when BMP or NSR is enabledSame juniper networks/junos os package
  • Junos OS and Junos OS Evolved: Unauthenticated network access causes full device takeover when J-Web is enabledSame juniper networks/junos os package
  • Junos OS and Junos OS Evolved: A malformed LSP-ping causes an rpd crashSame juniper networks/junos os package
  • Junos OS and Junos OS Evolved: A specific BGP packet causes an rpd crash when an ECMP qualifier is used in an import policySame juniper networks/junos os package
  • Junos OS and Junos OS Evolved: An attacker sending a malformed update causes an rpd crash when BGP EVPN signaling is usedSame juniper networks/junos os package

Record context

Vulnerability class
Privilege Escalation
EPSS
Not reported
CWE IDs
CWE-122
Source
CVE List V5
Source checked
Oct 14, 2026
References
1 linked source
Open source record