CVE-2016-20031

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-03-16. the CNA's CVSS baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Elevated
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: Elevated riskExposed: 0

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

ZKTeco ZKBioSecurity 3.0 contains a local authorization bypass vulnerability in visLogin.jsp that allows attackers to authenticate without valid credentials by spoofing localhost requests. Attackers can exploit the EnvironmentUtil.getClientIp() method which treats IPv6 loopback address 0:0:0:0:0:0:0:1 as 127.0.0.1 and authenticates using the IP as username with hardcoded password 123456 to access sensitive information and perform unauthorized actions.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

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
Severity55% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

March 16, 2026

Last Modified

July 28, 2026

Advisory Details (6)

Auto-updated Jul 28, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

ZKTeco ZKBioSecurity 3.0 Local Authorization Bypass via visLogin.jsp | Advisories | VulnCheck

https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-local-authorization-bypass-via-vislogin-jsp
generic🟡 PoC Available

ZKTeco ZKBioSecurity 3.0 - 'visLogin.jsp' Local Authentication Bypass - JSP webapps Exploit

https://www.exploit-db.com/exploits/40327/
generic

Packet Storm Security

https://packetstormsecurity.com/files/138571
generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/116488
generic

ZKTeco ZKBioSecurity 3.0 (visLogin.jsp) Local Authorization Bypass - CXSecurity.com

https://cxsecurity.com/issue/WLB-2016090003
generic🔴 Active Exploitation

Zero Science Lab — Information Security Research & Development Laboratory

https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5367.php

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 15× 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 154 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2016-20031?
CVE-2016-20031 is a medium vulnerability published on March 16, 2026. ZKTeco ZKBioSecurity 3.0 contains a local authorization bypass vulnerability in visLogin.jsp that allows attackers to authenticate without valid credentials by spoofing localhost requests. Attackers can exploit the EnvironmentUtil.getClientIp() method which treats IPv6 loopback address…
When was CVE-2016-20031 disclosed?
CVE-2016-20031 was first published in the National Vulnerability Database on March 16, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-20031 actively exploited?
CVE-2016-20031 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 95.5% of all scored CVEs.
What is the CVSS score of CVE-2016-20031?
CVE-2016-20031 has a CVSS v4.0 base score of 5.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2016-20031?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-20031, 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

Explore the affected products and dependency analysis for CVE-2016-20031

Explore →

Is Your Infrastructure Affected by CVE-2016-20031?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs