CVE-2023-36844

MEDIUMNVD 5.39.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2023-11-13), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 5.3 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
5.3
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 91%CVSS: 5.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to control certain, important environment variables.

Using a crafted request an attacker is able to modify

certain PHP environment variables leading to partial loss of integrity, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on EX Series:

* All versions prior to 20.4R3-S9; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S7; * 21.3 versions

prior to

21.3R3-S5; * 21.4 versions

prior to

21.4R3-S5; * 22.1 versions

prior to

22.1R3-S4; * 22.2 versions

prior to

22.2R3-S2; * 22.3 versions

prior to 22.3R3-S1; * 22.4 versions

prior to

22.4R2-S2, 22.4R3; * 23.2 versions prior to

23.2R1-S1, 23.2R2.

CVSS v3
5.3
EG Score
9.0(high)
EPSS
99.8%
KEV
⚠ Exploited

Published

August 17, 2023

Last Modified

October 24, 2025

Advisory Details (3)

Auto-updated Jun 13, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36844
generic

CEC Juniper Community

https://supportportal.juniper.net/JSA72300
generic

Packet Storm

http://packetstormsecurity.com/files/174865/Juniper-SRX-Firewall-EX-Switch-Remote-Code-Execution.html

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 53× in last 7d / 222× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 394 total refreshes for this CVE.

  1. 2026-07-22 19:40 UTCCISA KEV update
  2. 2026-07-22 19:00 UTCGHSA enrichment
  3. 2026-07-22 15:09 UTCEG score recompute
  4. 2026-07-22 15:09 UTCGHSA enrichment
  5. 2026-07-22 14:06 UTCEPSS rescore
  6. 2026-07-22 11:18 UTCGHSA enrichment
  7. 2026-07-22 07:27 UTCGHSA enrichment
  8. 2026-07-22 03:36 UTCGHSA enrichment
  9. 2026-07-21 23:47 UTCGHSA enrichment
  10. 2026-07-21 19:56 UTCGHSA enrichment
  11. 2026-07-21 16:05 UTCGHSA enrichment
  12. 2026-07-21 14:37 UTCCISA KEV update
  13. 2026-07-21 12:15 UTCGHSA enrichment
  14. 2026-07-21 08:24 UTCGHSA enrichment
  15. 2026-07-21 04:34 UTCGHSA enrichment
  16. 2026-07-21 00:44 UTCGHSA enrichment
  17. 2026-07-20 20:54 UTCGHSA enrichment
  18. 2026-07-20 17:04 UTCGHSA enrichment
  19. 2026-07-20 13:14 UTCGHSA enrichment
  20. 2026-07-20 09:24 UTCGHSA enrichment
  21. 2026-07-20 05:34 UTCGHSA enrichment
  22. 2026-07-20 01:45 UTCGHSA enrichment
  23. 2026-07-19 21:54 UTCGHSA enrichment
  24. 2026-07-19 18:05 UTCEG score recompute
  25. 2026-07-19 18:05 UTCGHSA enrichment
Show 75 more
  1. 2026-07-19 14:29 UTCEPSS rescore
  2. 2026-07-19 14:29 UTCEPSS rescore
  3. 2026-07-19 14:15 UTCGHSA enrichment
  4. 2026-07-19 10:26 UTCGHSA enrichment
  5. 2026-07-19 06:36 UTCGHSA enrichment
  6. 2026-07-19 02:46 UTCGHSA enrichment
  7. 2026-07-18 22:56 UTCGHSA enrichment
  8. 2026-07-18 19:06 UTCGHSA enrichment
  9. 2026-07-18 15:16 UTCGHSA enrichment
  10. 2026-07-18 11:26 UTCGHSA enrichment
  11. 2026-07-18 07:36 UTCGHSA enrichment
  12. 2026-07-18 03:46 UTCGHSA enrichment
  13. 2026-07-17 23:56 UTCGHSA enrichment
  14. 2026-07-17 20:06 UTCGHSA enrichment
  15. 2026-07-17 16:16 UTCGHSA enrichment
  16. 2026-07-17 12:26 UTCGHSA enrichment
  17. 2026-07-17 08:36 UTCEG score recompute
  18. 2026-07-17 08:36 UTCGHSA enrichment
  19. 2026-07-17 04:46 UTCGHSA enrichment
  20. 2026-07-17 00:56 UTCGHSA enrichment
  21. 2026-07-16 21:06 UTCGHSA enrichment
  22. 2026-07-16 17:16 UTCGHSA enrichment
  23. 2026-07-16 17:04 UTCCISA KEV update
  24. 2026-07-16 13:26 UTCGHSA enrichment
  25. 2026-07-16 09:36 UTCGHSA enrichment
  26. 2026-07-16 05:46 UTCGHSA enrichment
  27. 2026-07-16 01:56 UTCGHSA enrichment
  28. 2026-07-15 22:06 UTCGHSA enrichment
  29. 2026-07-15 18:16 UTCGHSA enrichment
  30. 2026-07-15 16:56 UTCEPSS rescore
  31. 2026-07-15 16:56 UTCEPSS rescore
  32. 2026-07-15 16:49 UTCCISA KEV update
  33. 2026-07-15 15:04 UTCCISA KEV update
  34. 2026-07-15 14:25 UTCGHSA enrichment
  35. 2026-07-15 10:35 UTCGHSA enrichment
  36. 2026-07-15 06:43 UTCGHSA enrichment
  37. 2026-07-15 02:53 UTCGHSA enrichment
  38. 2026-07-15 01:58 UTCEPSS rescore
  39. 2026-07-15 01:58 UTCEPSS rescore
  40. 2026-07-14 23:03 UTCGHSA enrichment
  41. 2026-07-14 19:12 UTCGHSA enrichment
  42. 2026-07-14 18:05 UTCCISA KEV update
  43. 2026-07-14 15:22 UTCGHSA enrichment
  44. 2026-07-14 11:31 UTCGHSA enrichment
  45. 2026-07-14 07:41 UTCGHSA enrichment
  46. 2026-07-14 03:51 UTCGHSA enrichment
  47. 2026-07-14 00:01 UTCGHSA enrichment
  48. 2026-07-13 20:11 UTCGHSA enrichment
  49. 2026-07-13 17:07 UTCCISA KEV update
  50. 2026-07-13 16:21 UTCGHSA enrichment
  51. 2026-07-13 12:29 UTCGHSA enrichment
  52. 2026-07-13 08:38 UTCGHSA enrichment
  53. 2026-07-13 06:11 UTCEPSS rescore
  54. 2026-07-13 06:11 UTCEPSS rescore
  55. 2026-07-13 04:49 UTCGHSA enrichment
  56. 2026-07-13 00:59 UTCGHSA enrichment
  57. 2026-07-12 21:09 UTCGHSA enrichment
  58. 2026-07-12 17:19 UTCGHSA enrichment
  59. 2026-07-12 13:29 UTCGHSA enrichment
  60. 2026-07-12 09:39 UTCGHSA enrichment
  61. 2026-07-12 05:49 UTCGHSA enrichment
  62. 2026-07-12 01:59 UTCGHSA enrichment
  63. 2026-07-11 22:09 UTCGHSA enrichment
  64. 2026-07-11 18:19 UTCGHSA enrichment
  65. 2026-07-11 14:29 UTCGHSA enrichment
  66. 2026-07-11 10:38 UTCGHSA enrichment
  67. 2026-07-11 06:49 UTCGHSA enrichment
  68. 2026-07-11 02:59 UTCGHSA enrichment
  69. 2026-07-10 23:08 UTCGHSA enrichment
  70. 2026-07-10 19:18 UTCGHSA enrichment
  71. 2026-07-10 17:52 UTCCISA KEV update
  72. 2026-07-10 15:27 UTCGHSA enrichment
  73. 2026-07-10 11:38 UTCGHSA enrichment
  74. 2026-07-10 07:47 UTCGHSA enrichment
  75. 2026-07-10 03:55 UTCGHSA enrichment

Publicly available exploits

(3 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCr3dcl1ff/CVE-2023-36844_Juniper_RCE
    First seen Sep 24, 2023

    A Proof of Concept for chaining the CVEs [CVE-2023-36844, CVE-2023-36845, CVE-2023-36846, CVE-2023-36847] to achieve Remote Code Execution (phpinfo) in Juniper JunOS within SRX and EX Series products.Modified from original exploit developed by @watchTowr .

    Open source ↗
  • GitHub PoCwatchtowrlabs/juniper-rce_cve-2023-36844
    First seen Aug 25, 2023
    Open source ↗
  • Nucleihttp/cves/2023/CVE-2023-36844.yaml
    First seen Jan 1, 2023

    Juniper Devices - Remote Code Execution

    Open source ↗

Frequently asked(6)

What is CVE-2023-36844?
CVE-2023-36844 is a medium vulnerability published on August 17, 2023. A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to control certain, important environment variables. Using a crafted request an attacker is able to modify certain PHP environment variables…
When was CVE-2023-36844 disclosed?
CVE-2023-36844 was first published in the National Vulnerability Database on August 17, 2023, with the most recent update on October 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-36844 actively exploited?
Yes. CISA added CVE-2023-36844 to the Known Exploited Vulnerabilities catalog on November 13, 2023, affecting Juniper Junos OS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2023-36844?
CVE-2023-36844 has a CVSS v3 base score of 5.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2023-36844?
CVE-2023-36844 affects Juniper Junos OS. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2023-36844?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-36844, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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