Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability
A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 3 / 5
- KEV catalog (CISA)13 Nov 2023
- Exploited in EUVD (ENISA)13 Nov 2023
- Used by ransomwareno
- EPSS above 10 %1.1%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to webauth_operation.php that doesn't require authentication, an attacker is able to upload and download arbitrary files via J-Web, leading to a loss of integrity or confidentiality, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on SRX Series: * 21.2 versions prior to 21.2R3-S8; * 21.4 versions prior to 21.4R3-S6; * 22.1 versions prior to 22.1R3-S5; * 22.2 versions prior to 22.2R3-S3; * 22.3 versions prior to 22.3R3-S2; * 22.4 versions prior to 22,4R2-S2, 22.4R3; * 23.2 versions prior to 23.2R1-S2, 23.2R2.
Affected products
- 22.3 <22.3R3-S2
- 23.2 <23.2R1-S2, 23.2R2
- 22.1 <22.1R3-S5
- 21.2 <21.2R3-S8
- 21.4 <21.4R3-S6
- 22.2 <22.2R3-S3
- 22.4 <22.4R2-S2, 22.4R3
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
References
Other exploited vulnerabilities from the same vendor
- CVE-2015-7755Juniper ScreenOS Improper Authentication Vulnerability8.2 · Background exploitation
- CVE-2025-21590Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability3.9 · Background exploitation
- CVE-2023-36847Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability7.0 · Background exploitation
- CVE-2023-36846Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability7.3 · Background exploitation
- CVE-2023-36845Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability9.2 · Background exploitation
- CVE-2023-36844Juniper Junos OS EX Series PHP External Variable Modification Vulnerability7.2 · Background exploitation