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CVE-2026-33792

Junos OS: SRX Series: An attacker causes remote code execution and denial of service when a GRE tunnel is configured

Critical9.3EPSS 0.61%
Published
Updated
Reserved
Assigned by
juniper

Description

A Stack-based Buffer Overflow vulnerability in the srxpfe process of Juniper Networks Junos OS on SRX Series allows an unauthenticated network attacker to execute code as root or cause a denial of service via a crafted packet received on a configured GRE tunnel.

Scores

CVSS scores of CVE-2026-33792, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)4.0Critical9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M
juniperCNA (assigner)3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Awaiting Analysis4.0Critical9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:X
EPSS (exploitation in 30 days)
0.61% · top 51% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.3.

Weakness

Affected products

  • Juniper Networks · Junos OS

    • affected < 23.2R2-S7.7
    • affected 23.4 – < 23.4R2-S8.13
    • affected 24.2 – < 24.2R2-S5.5
    • affected 24.4 – < 24.4R2-S5
    • affected 25.2 – < 25.2R2-S2
    • affected 25.4 – < 25.4R1-S3
    • affected 26.2 – < 26.2R1-S2

What to do

Solution: The following software releases have been updated to resolve this specific issue: Junos OS: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1, and all subsequent releases. Note: For Junos OS releases 23.2, 23.4, and 24.2, specific respins have been referenced. Previously published versions of these releases have been rebuilt to resolve the security vulnerabilities identified in this advisory.

Workaround: There are no known workarounds for this issue.

Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .