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ExploitedIn CISA KEVFix available

CVE-2023-36846

Exploitation confirmed. First attested on 2023-11-13 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2023-08-17
  • Fixed in20.4
  • WeaknessCWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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 user.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 SRX 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-S5; * 22.1 versions prior to 22.1R3-S3; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R2-S2, 22.3R3; * 22.4 versions prior to 22.4R2-S1, 22.4R3.

Timeline

dates in UTC
  1. 2023-08-1720:15CVE publishedNVD
  2. 2023-11-13Added to the CISA KEV catalogCISA KEV
  3. 2023-11-13Listed as exploited by GCVEGCVE
  4. 2023-11-13Exploitation first reportedCISA KEV
  5. 2023-11-1516:40SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-36846?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-36846?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Juniper junosversion to verify
BranchAffectedFixed in
20.4< 20.420.4
20.4= 20.4no fix published
21.1= 21.1no fix published
21.2= 21.2no fix published
21.3= 21.3no fix published
21.4= 21.4no fix published
22.1= 22.1no fix published
22.2= 22.2no fix published
22.3= 22.3no fix published
22.4= 22.4no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As juniper, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Juniper Networks Junos OSother versions: not affected

    platforms: SRX Series

    Affected
    • < 20.4R3-S8fixed in 20.4R3-S8semver
    • ≥ 21.1, < 21.1*fixed in 21.1*semver
    • ≥ 21.2, < 21.2R3-S6fixed in 21.2R3-S6semver
    • ≥ 21.3, < 21.3R3-S5fixed in 21.3R3-S5semver
    • ≥ 21.4, < 21.4R3-S5fixed in 21.4R3-S5semver
    • ≥ 22.1, < 22.1R3-S3fixed in 22.1R3-S3semver
    • ≥ 22.2, < 22.2R3-S2fixed in 22.2R3-S2semver
    • ≥ 22.3, < 22.3R2-S2, 22.3R3fixed in 22.3R2-S2, 22.3R3semver

    1 more version line in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-09-26

Fix

  1. Update Juniper junos to 20.4
  2. CISA’s required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.due 2023-11-17

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedChocapikk/CVE-2023-36846
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2023-11-13
Patch Due Date
2023-11-17
Ransomware Use
Unknown
Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Published
2023-08-17
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-rrhw-mwxf-m9mp

Frequently asked questions

What is CVE-2023-36846?

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 user.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 SRX 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-S5; * 22.1 versions prior to 22.1R3-S3; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R2-S2, 22.3R3; * 22.4 versions prior to 22.4R2-S1, 22.4R3.

Is CVE-2023-36846 actively exploited?

Yes. CVE-2023-36846 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-11-17.

What is the CVSS score for CVE-2023-36846?

CVE-2023-36846 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

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