CVE-2026-33783: A Function Call With Incorrect Argument Type vulnerability in the sensor interface of Juniper Networks Junos O

Q: How do I fix CVE-2026-33783?

junos os evolved: upgrade to 22.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-33783 being exploited?

CVE-2026-33783 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33783 affect?

CVE-2026-33783 affects junos os evolved. Severity is medium (CVSS 6.5). A Function Call With Incorrect Argument Type vulnerability in the sensor interface of Juniper Networks Junos OS Evolved on PTX Series allows a network-based, authenticated attacker with low privileges to cause a complete Denial of Service (

Q: How urgent is CVE-2026-33783?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-33783 is a medium-severity flaw (CVSS 6.5) affecting junos os evolved. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Function Call With Incorrect Argument Type vulnerability in the sensor interface of Juniper Networks Junos OS Evolved on PTX Series allows a network-based, authenticated attacker with low privileges to cause a complete Denial of Service (DoS). If colored SRTE policy tunnels are provisioned via PCEP, and gRPC is used to monitor traffic in these tunnels, evo-aftmand crashes and doesn't restart which leads to a complete and persistent service im

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-686
Published	2026-04-09
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 22:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

juniper junos os evolved UPGRADE

Affected: < 22.4 · 22.4 · 22.4 r1 · 22.4 r1-s1 · 22.4 r1-s2 · 22.4 r2 · 22.4 r2-s1 · 22.4 r2-s2

Fixed in: 22.4

Safe to downgrade to: no unaffected older release

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-2026-33783?

junos os evolved: upgrade to 22.4. Exact commands for each OS are on this page.

Is CVE-2026-33783 being exploited?

CVE-2026-33783 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-2026-33783 affect?

CVE-2026-33783 affects junos os evolved. Severity is medium (CVSS 6.5). A Function Call With Incorrect Argument Type vulnerability in the sensor interface of Juniper Networks Junos OS Evolved on PTX Series allows a network-based, authenticated attacker with low privileges to cause a complete Denial of Service (

How urgent is CVE-2026-33783?

Priority 26/100. No elevated risk signals yet.

Software pages

Juniper Junos vulnerabilities

Related CVEs

CVE-2026-33791 MEDIUM 6.7 UPGRADE UPGRADE An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and Junos OS Evolved
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CVE-2026-33797 HIGH 7.4 MITIGATE MITIGATE An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthe
CVE-2026-33780 MEDIUM 6.5 UPGRADE UPGRADE A Missing Release of Memory after Effective Lifetime vulnerability in the Layer 2 Address Learning Daemon (l2a
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References

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