Secuno
ENNL
Book demo

CVE-2023-36847

Juniper Junos OS EX Series Missing Authentication for Critical Function

5.3 MEDIUMActively exploited (CISA KEV)EPSS 83.5%
  1. Published17 Aug 2023
  2. Added to CISA KEV13 Nov 2023
  3. Remediation due17 Nov 2023
Actively exploited (CISA KEV)

Juniper Junos OS on EX Series contains a missing authentication for critical function vulnerability that allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to installAppPackage.php that doesn't require authentication, an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities.

Added to KEV: 13 Nov 2023Federal remediation due: 17 Nov 2023

Description

A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to installAppPackage.php that doesn't require authentication an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on EX Series: * All versions prior to 20.4R3-S8; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S6; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S4; * 22.1 versions prior to 22.1R3-S3; * 22.2 versions prior to 22.2R3-S1; * 22.3 versions prior to 22.3R2-S2, 22.3R3; * 22.4 versions prior to 22.4R2-S1, 22.4R3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

Juniper Junos< 20.4 · 20.4 · 21.1 · 21.2

Remediation

Fixed in
Juniper Junos≥ 20.4

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-876899.8
The Metasploit Framework Web Service REST API (msf-ws) exposes the credential store…
CVE-2026-843138.8
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, POST…
CVE-2026-1095759.8
In HAProxy Data Plane API 2.2.0 through 3.4.3 (and corresponding Enterprise Edition…
CVE-2026-571189.8
PraisonAI is a multi-agent teams system. Prior to praisonaiagents 1.6.59,…
CVE-2026-1093718.2
ZITADEL 3.0.0 before 4.18.0 contains a missing authentication vulnerability in the…
CVE-2026-1085498.1
cc-connect through 1.5.0 contains a missing authentication vulnerability in the MAX…

Frequently asked

Is CVE-2023-36847 being actively exploited?

Yes. CVE-2023-36847 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 13 Nov 2023.

How severe is CVE-2023-36847?

CVE-2023-36847 has a CVSS 3.1 base score of 5.3, rated medium. EPSS estimates a 83.5% probability of exploitation.

Which products are affected by CVE-2023-36847?

Affected products include Juniper Junos.

How do I fix CVE-2023-36847?

Upgrade affected software to a fixed version, for example Juniper Junos 20.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-36847 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.