EUVD-2026-42708
GHSA-h2m8-76wp-v324
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/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:X/RE:M/U:X
Network-reachable with no auth or interaction required; DoS-only impact with auto-restart limits availability to Low; unchanged scope.
Primary rating from Vendor (juniper).
CVSS VectorVendor: juniper
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/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:X/RE:M/U:X
Lifecycle Timeline
3DescriptionCVE.org
An Out-of-bounds Write vulnerability in the http-gatekeeper (http-gk) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
If an SRX Series device is configured for remote-access VPN with pre-logon compliance check, a network-based attacker sending specifically formatted requests can trigger an out of bounds write leading to an http-gk process crash. This crash leads to unavailability of all services depending on the [ system services web-management ] configuration (like J-Web, remote access VPN and firewall authentication) until the process automatically restarts.
This issue affects Junos OS on SRX Series:
- 23.2 versions before 23.2R2-S7,
- 23.4 versions before 23.4R2-S8,
- 24.2 versions before 24.2R2-S4,
- 24.4 versions before 24.4R2-S4,
- 25.2 versions before 25.2R2,
- 25.4 versions before 25.4R1-S1, 25.4R2.
AnalysisAI
Out-of-bounds write in the Juniper Networks Junos OS http-gatekeeper (http-gk) process on SRX Series firewalls crashes the process when handling crafted network requests, taking down all web-management-dependent services including J-Web, remote-access VPN, and firewall authentication until automatic process recovery. Exploitation is gated on a specific non-default configuration - remote-access VPN with pre-logon compliance check enabled - limiting the exposed population to SRX deployments that actively use this feature. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target SRX Series device to be configured with remote-access VPN AND the pre-logon compliance check feature specifically enabled - this is a non-default configuration that must be deliberately provisioned. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.3 (Medium) with vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L accurately captures the core risk profile: network-reachable, zero-complexity exploit with no authentication requirement, but impact is limited to temporary availability loss with no confidentiality or integrity exposure. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated external attacker identifies an SRX Series firewall exposing its remote-access VPN endpoint with pre-logon compliance check enabled, then sends a crafted HTTP request sequence designed to trigger the out-of-bounds write in http-gk. The daemon crashes, immediately terminating J-Web, remote-access VPN sessions, and firewall authentication for all users; the attacker can repeat the trigger request each time the process auto-restarts to maintain a continuous denial of service, blocking remote workforce access and administrative management of the firewall during the disruption period. |
| Remediation | Upgrade Junos OS on affected SRX devices to a fixed release: 23.2R2-S7 or later in the 23.2 train, 23.4R2-S8 or later in the 23.4 train, 24.2R2-S4 or later in the 24.2 train, 24.4R2-S4 or later in the 24.4 train, 25.2R2 or later in the 25.2 train, or 25.4R1-S1 / 25.4R2 or later in the 25.4 train. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Memory Corruption
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External POC / Exploit Code
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