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
62%
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 42× in last 7d / 232× 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 488 total refreshes for this CVE.

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

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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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