CVE-2026-33773: Juniper Networks Junos OS · Incorrect Initialization of Resource
Affects Juniper Networks Junos OSSource CVE Database V5
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
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 9 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| Juniper NetworksJunos OS | Affected
| Fixed in
|
| Juniper NetworksJunos OS | Affected
| Fixed in
|
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.