CVE-2023-36851
Confirmed PUBLISHEDJunos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload and download arbitrary files
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Sep 26, 2023
- Exploitation Reported
- Nov 13, 2023
- CVSS
- 5.3 Medium
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Juniper Networks |
Junos OS
|
21.2 to < 21.2R3-S8 |
Affected |
| Juniper Networks |
Junos OS
|
21.4 to < 21.4R3-S6 |
Affected |
| Juniper Networks |
Junos OS
|
22.1 to < 22.1R3-S5 |
Affected |
| Juniper Networks |
Junos OS
|
22.2 to < 22.2R3-S3 |
Affected |
| Juniper Networks |
Junos OS
|
22.3 to < 22.3R3-S2 |
Affected |
| Juniper Networks |
Junos OS
|
22.4 to < 22.4R2-S2, 22.4R3 |
Affected |
| Juniper Networks |
Junos OS
|
23.2 to < 23.2R1-S2, 23.2R2 |
Affected |
CVE References
- Vendor Advisory — supportportal.juniper.net supportportal.juniper.net · Vendor Advisory https://supportportal.juniper.net/JSA72300
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2023-11-13 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Exploitation Status
Exploited in the wild
Recorded 2023-11-13 00:00:00 UTC · CISA
Weaknesses (CWE)
-
Missing Authentication for Critical Function
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nessus | https://www.tenable.com/plugins/nessus/180190 | Jun 02, 2025 |
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
09:26 UTC about 1 year ago09:26 UTC · about 1 year ago
Nessus plugin available
Scanner coverage available
-
00:00 UTC over 2 years ago00:00 UTC · over 2 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
19:53 UTC almost 3 years ago19:53 UTC · almost 3 years ago
CVE published
Vulnerability disclosed publicly
-
16:17 UTC about 3 years ago16:17 UTC · about 3 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2023-36851
{
"cve_id": "CVE-2023-36851",
"title": "Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated atta...",
"affected_vendor": "Juniper Networks",
"affected_product": "Junos OS",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 5.3,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}