CVE-2015-7755

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-10-02), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 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
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 61%CVSS: 9.8Exploit: NoneExposed: 0

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

Juniper ScreenOS 6.2.0r15 through 6.2.0r18, 6.3.0r12 before 6.3.0r12b, 6.3.0r13 before 6.3.0r13b, 6.3.0r14 before 6.3.0r14b, 6.3.0r15 before 6.3.0r15b, 6.3.0r16 before 6.3.0r16b, 6.3.0r17 before 6.3.0r17b, 6.3.0r18 before 6.3.0r18b, 6.3.0r19 before 6.3.0r19b, and 6.3.0r20 before 6.3.0r21 allows remote attackers to obtain administrative access by entering an unspecified password during a (1) SSH or (2) TELNET session.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: 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
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS
99.1%
KEV
⚠ Exploited

Published

December 19, 2015

Last Modified

April 21, 2026

Advisory Details (7)

Auto-updated Apr 29, 2026
No patch confirmed yet. Sources: cert.
generic

Important Announcement about ScreenOS®

https://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554
generic

Much ado about Juniper - Adam Caudill

https://adamcaudill.com/2015/12/17/much-ado-about-juniper/
generic

Secret Code Found in Juniper's Firewalls Shows Risk of Government Backdoors | WIRED

http://www.wired.com/2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors/
cert

VU#640184 - Juniper ScreenOS contains multiple vulnerabilities

http://www.kb.cert.org/vuls/id/640184
generic

Juniper Says It Didn't Work With Government To Add 'Unauthorized Code' To Network Gear

http://www.forbes.com/sites/thomasbrewster/2015/12/18/juniper-says-it-didnt-work-with-government-to-add-unauthorized-code-to-network-gear/
generic

CEC Juniper Community

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713
generic

“Unauthorized code” in Juniper firewalls decrypts encrypted VPN traffic - Ars Technica

http://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/

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 430 total refreshes for this CVE.

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

Publicly available exploits

(3 references)

Working exploit code is in the public domain (1 Metasploit module) (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCcinno/CVE-2015-7755-POC
    First seen Jan 9, 2016
    Open source ↗
  • Metasploitauxiliary/scanner/ssh/juniper_backdoor✓ verified
    First seen Dec 20, 2015

    Juniper SSH Backdoor Scanner

    Open source ↗
  • GitHub PoChdm/juniper-cve-2015-7755
    First seen Dec 18, 2015

    Notes, binaries, and related information from analysis of the CVE-2015-7755 & CVE-2015-7756 issues within Juniper ScreenOS

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2015-7755?
CVE-2015-7755 is a critical vulnerability published on December 19, 2015. Juniper ScreenOS 6.2.0r15 through 6.2.0r18, 6.3.0r12 before 6.3.0r12b, 6.3.0r13 before 6.3.0r13b, 6.3.0r14 before 6.3.0r14b, 6.3.0r15 before 6.3.0r15b, 6.3.0r16 before 6.3.0r16b, 6.3.0r17 before 6.3.0r17b, 6.3.0r18 before 6.3.0r18b, 6.3.0r19 before 6.3.0r19b, and 6.3.0r20 before 6.3.0r21 allows…
When was CVE-2015-7755 disclosed?
CVE-2015-7755 was first published in the National Vulnerability Database on December 19, 2015, with the most recent update on April 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-7755 actively exploited?
Yes. CISA added CVE-2015-7755 to the Known Exploited Vulnerabilities catalog on October 2, 2025, affecting Juniper ScreenOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2015-7755?
CVE-2015-7755 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2015-7755?
CVE-2015-7755 affects Juniper ScreenOS. 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-2015-7755?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-7755, 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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