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VulnerabilityPublished Updated

CVE-2026-33773: Juniper Networks Junos OS · Incorrect Initialization of Resource

Affects Juniper Networks Junos OSSource CVE Database V5

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Not known to be exploited · CVSS 5.8 Medium : upgrade to 24.2R2-S4 or 23.4R2-S7 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
5.8Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 24.2R2-S4, 23.4R2-S7
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade Juniper Networks Junos OS to 24.2R2-S4 or 23.4R2-S7.

Affected software

ProductAffectedFixed in
Juniper NetworksJunos OSAffected
  • >=24.2R2-S3 <24.2R2-S4
Fixed in
  • 24.2R2-S4
Juniper NetworksJunos OSAffected
  • >=23.4R2-S6 <23.4R2-S7
Fixed in
  • 23.4R2-S7

AI-suggested

A patch is available for this vulnerability. Since Junos OS is provided as a cloud service, Juniper Networks manages remediation server-side. Users should verify with Juniper's official advisory and ensure their devices are updated to versions beyond 23.4R2-S6 and 24.2R2-S3 or apply the provided patches to mitigate the issue. No additional mitigation steps are indicated by the vendor advisory.

Description

An Incorrect Initialization of Resource vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on specific EX Series and QFX Series device allows an unauthenticated, network-based attacker to cause an integrity impact to downstream networks. When the same family inet or inet6 filter is applied on an IRB interface and on a physical interface as egress filter on EX4100, EX4400, EX4650 and QFX5120 devices, only one of the two filters will be applied, which can lead to traffic being sent out one of these interfaces which should have been blocked. This issue affects Junos OS on EX Series and QFX Series: * 23.4 version 23.4R2-S6, * 24.2 version 24.2R2-S3. No other Junos OS versions are affected.

References

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