CVE-2023-36851

CRITICALNVD 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1%CVSS: 5.3Exploit: cisa kev · ssvc activeExposed: 0

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

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.

CVSS v3
5.3
EG Score
9.0(high)
EG Risk
96(Act)
EG Risk 96/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
1%
EPSS %ILE
65%
KEV
⚠ Exploited

Published

September 27, 2023

Last Modified

February 26, 2026

Advisory Details (2)

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-2023-36851
generic

CEC Juniper Community

https://supportportal.juniper.net/JSA72300

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 55× in last 7d / 246× 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 936 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2023-36851?
CVE-2023-36851 is a critical vulnerability published on September 27, 2023. 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…
When was CVE-2023-36851 disclosed?
CVE-2023-36851 was first published in the National Vulnerability Database on September 27, 2023, with the most recent update on February 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-36851 actively exploited?
Yes. CISA added CVE-2023-36851 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-2023-36851?
CVE-2023-36851 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-2023-36851?
CVE-2023-36851 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-2023-36851?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-36851, 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.

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