CVE-2026-57029: A Missing Synchronization vulnerability in the flow collector handler of Juniper Networks Junos OS Evolved on

Routine

MEDIUM 5.3MITIGATE

CVE-2026-57029 is a medium-severity flaw (CVSS 5.3) affecting junos os evolved. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 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-p

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-820
Published	2026-07-09
Last modified	2026-10-25

Publisher (CNA): Juniper Networks, Inc. · Vendor: juniper

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-09 22:17 UTCPublished CVE record published
2026-10-25 15:10 UTCUpdated Record last modified

juniper junos os evolved MITIGATE

Affected: 23.2 · 23.4 · 23.4 r1 · 23.4 r1-s1 · 23.4 r1-s2 · 23.4 r2 · 23.4 r2-s1 · 23.4 r2-s2

Fixed in: no fixed release known

Safe to downgrade to: a release before 23.2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57029?

junos os evolved: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-57029 being exploited?

CVE-2026-57029 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57029 affect?

CVE-2026-57029 affects junos os evolved. Severity is medium (CVSS 5.3). 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 co

How urgent is CVE-2026-57029?

Priority 21/100. No elevated risk signals yet.

Software pages

Juniper Junos vulnerabilities

Related CVEs

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CVE-2026-57028 HIGH 7.3 UPGRADE An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos

References

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