CVE-2026-102084
Junos OS: SRX Series: In an ADVPN scenario a malformed message from a peer causes Remote Code Execution
An Improper Validation of Syntactic Correctness of Input vulnerability in the VPN daemon of Juniper Networks Junos OS on SRX Series allows an authenticated, network-based attacker to take complete control of the device.
If an SRX device configured for AutoDiscovery VPN (ADVPN) receives a message from a peer that contains one or more specifically malformed attributes, this will cause a buffer overflow, which can allow remote code execution and therefore allow an attacker to take complete control of the device. To be able to carry out this attack an attacker must either have acquired the shared secret to impersonate a peer or have compromised an existing one, so this attack is considerably difficult.
This issue affects Junos OS on SRX Series:
- All versions before 23.2R2-S7.7;
- from 23.4 before 23.4R2-S7;
- from 24.2 before 24.2R2-S4;
- from 24.4 before 24.4R2-S3;
- from 25.2 before 25.2R2;
- from 25.4 before 25.4R1-S3.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Junos OS: SRX Series: In an ADVPN scenario a malformed message from a peer causes Remote Code Execution
An Improper Validation of Syntactic Correctness of Input vulnerability in the VPN daemon of Juniper Networks Junos OS on SRX Series allows an authenticated, network-based attacker to take complete control of the device.
If an SRX device configured for AutoDiscovery VPN (ADVPN) receives a message from a peer that contains one or more specifically malformed attributes, this will cause a buffer overflow, which can allow remote code execution and therefore allow an attacker to take complete control of the device. To be able to carry out this attack an attacker must either have acquired the shared secret to impersonate a peer or have compromised an existing one, so this attack is considerably difficult.
This issue affects Junos OS on SRX Series:
- All versions before 23.2R2-S7.7;
- from 23.4 before 23.4R2-S7;
- from 24.2 before 24.2R2-S4;
- from 24.4 before 24.4R2-S3;
- from 25.2 before 25.2R2;
- from 25.4 before 25.4R1-S3.
- Record
CVE-2026-102084- CVSS 4.0
- 9.2 Critical
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:N/R:U/RE:M - CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-1286
- Updated
- 2026-11-02
EUVDEUVD-2026-101458
An Improper Validation of Syntactic Correctness of Input vulnerability in the VPN daemon of Juniper Networks Junos OS on SRX Series allows an authenticated, network-based attacker to take complete control of the device.
If an SRX device configured for AutoDiscovery VPN (ADVPN) receives a message from a peer that contains one or more specifically malformed attributes, this will cause a buffer overflow, which can allow remote code execution and therefore allow an attacker to take complete control of the device. To be able to carry out this attack an attacker must either have acquired the shared secret to impersonate a peer or have compromised an existing one, so this attack is considerably difficult.
This issue affects Junos OS on SRX Series:
- All versions before 23.2R2-S7.7;
- from 23.4 before 23.4R2-S7;
- from 24.2 before 24.2R2-S4;
- from 24.4 before 24.4R2-S3;
- from 25.2 before 25.2R2;
- from 25.4 before 25.4R1-S3.
- Record
EUVD-2026-101458- CVSS 4.0
- 9.2 Critical
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:N/R:U/RE:M - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-fwgj-cw99-g2wp
An Improper Validation of Syntactic Correctness of Input vulnerability in the VPN daemon of...
An Improper Validation of Syntactic Correctness of Input vulnerability in the VPN daemon of Juniper Networks Junos OS on SRX Series allows an authenticated, network-based attacker to take complete control of the device.
If an SRX device configured for AutoDiscovery VPN (ADVPN) receives a message from a peer that contains one or more specifically malformed attributes, this will cause a buffer overflow, which can allow remote code execution and therefore allow an attacker to take complete control of the device. To be able to carry out this attack an attacker must either have acquired the shared secret to impersonate a peer or have compromised an existing one, so this attack is considerably difficult.
This issue affects Junos OS on SRX Series:
- All versions before 23.2R2-S7.7;
- from 23.4 before 23.4R2-S7;
- from 24.2 before 24.2R2-S4;
- from 24.4 before 24.4R2-S3;
- from 25.2 before 25.2R2;
- from 25.4 before 25.4R1-S3.
- Record
GHSA-fwgj-cw99-g2wp- CVSS 4.0
- 9.2 Critical
CVSS:4.0/AV:N/AC:H/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:N/R:U/V:X/RE:M/U:X - CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-1286
- Updated
- 2026-11-02
NVD
An Improper Validation of Syntactic Correctness of Input vulnerability in the VPN daemon of Juniper Networks Junos OS on SRX Series allows an authenticated, network-based attacker to take complete control of the device.
If an SRX device configured for AutoDiscovery VPN (ADVPN) receives a message from a peer that contains one or more specifically malformed attributes, this will cause a buffer overflow, which can allow remote code execution and therefore allow an attacker to take complete control of the device. To be able to carry out this attack an attacker must either have acquired the shared secret to impersonate a peer or have compromised an existing one, so this attack is considerably difficult.
This issue affects Junos OS on SRX Series:
- All versions before 23.2R2-S7.7;
- from 23.4 before 23.4R2-S7;
- from 24.2 before 24.2R2-S4;
- from 24.4 before 24.4R2-S3;
- from 25.2 before 25.2R2;
- from 25.4 before 25.4R1-S3.
- Record
CVE-2026-102084- CVSS 4.0
- 9.2 Critical
CVSS:4.0/AV:N/AC:H/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:N/R:U/V:X/RE:M/U:X - CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-1286
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-102084 is a critical vulnerability (CVSS 9.2) in Juniper Networks Junos Os, published October 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.51%, the 43rd percentile. No source names a fixed version.