Cyber Resilience

CVE-2026-57029

Juniper Junos Os Evolved 23.2 … 25.2

Published
09 July 2026
Modified
13 July 2026
Patch / advisory
View advisory
CVSS Score v4 6.0
Click a component to see what it means
Raw vectorCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/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:Y/R:X/V:X/RE:M/U:X
EPSS Score 0.0019 9th percentile
Risk Priority 32 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-57029 is a medium-severity Missing Synchronization (CWE-820) vulnerability in Juniper Junos Os Evolved. Its CVSS base score is 6.0 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

A Missing Synchronization vulnerability in the flow collector handler of Juniper Networks Junos OS Evolved on QFX Series allows an adjacent, unauthenticated attacker to cause a Denial-of-Service (DoS). When the reachability of an sFlow collector changes, the corresponding next-hop entry…

more

is updated. If this update occurs simultaneously with the sFlow thread accessing the next-hop data (which is outside the attackers control), it causes the evo-pfemand process to crash, impacting all traffic forwarding until the automatic process restart has completed. This issue affects Junos OS Evolved on QFX Series: * all 23.2 versions, * 23.4 versions before 23.4R2-S7-EVO, * 24.2 versions before 24.2R2-S5-EVO, * 24.4 versions before 24.4R2-S3-EVO, * 25.2 versions before 25.2R2-EVO.

CWE(s)
CWE-820

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-47498Same product: Juniper Junos Os Evolved
CVE-2025-30644Same product: Juniper Qfx5110
CVE-2026-57025Same product: Juniper Junos Os Evolved
CVE-2024-39533Same product: Juniper Qfx5110
CVE-2025-59957Same product: Juniper Qfx5110
CVE-2024-30387Same vendor: Juniper
CVE-2023-28984Same product: Juniper Qfx10008
CVE-2024-30388Same product: Juniper Qfx5110
CVE-2025-52949Same product: Juniper Junos Os Evolved
CVE-2023-28964Same product: Juniper Junos Os Evolved

Affected Assets

juniper
junos os evolved
23.2, 23.4, 24.2, 24.4, 25.2

Mitigating Controls

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require proper concurrency controls and synchronization primitives during design and coding.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect missing synchronization through concurrency testing.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC practices can mandate concurrency controls and synchronization primitives.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify thread-safety and locking mechanisms.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles include proper synchronization for shared resources.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly require synchronization primitives to prevent race conditions.

References