CVE-2026-33794: An Improper Check for Unusual or Exceptional Conditions vulnerability in the advanced forwarding toolkit (ev

Routine

MEDIUM 5.9REMOTEMITIGATE

CVE-2026-33794 is a medium-severity flaw (CVSS 5.9) affecting junos os evolved. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Improper Check for Unusual or Exceptional Conditions vulnerability in the advanced forwarding toolkit (evo-aftmand) of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated network-based attacker generating continuous routing updates, resulting in unilist ECMP routes, to crash the evo-aftmand process on the PFE, leading to a Denial-of-Service (DoS). The conditions required for successful exploitation are based on a se

Why this priority

Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-754
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 21:16 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

juniper junos os evolved MITIGATE

Affected: 24.4 r2 · 24.4 r2-s1 · 24.4 r2-s2 · 25.2 · 25.2 r1 · 25.2 r1-s1 · 25.2 r1-s2

Fixed in: no fixed release known

Safe to downgrade to: a release before 24.4

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-2026-33794?

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

Is CVE-2026-33794 being exploited?

CVE-2026-33794 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-2026-33794 affect?

CVE-2026-33794 affects junos os evolved. Severity is medium (CVSS 5.9). An Improper Check for Unusual or Exceptional Conditions vulnerability in the advanced forwarding toolkit (evo-aftmand) of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated network-based attacker generating contin

How urgent is CVE-2026-33794?

Priority 34/100. Remotely exploitable, no login, no user action

Software pages

Juniper Junos vulnerabilities

Related CVEs

CVE-2026-33803 MEDIUM 6.5 UPGRADE An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos
CVE-2026-57028 HIGH 7.3 UPGRADE An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos
CVE-2026-57029 MEDIUM 5.3 MITIGATE A Missing Synchronization vulnerability in the flow collector handler of Juniper Networks Junos OS Evolved on

References

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