CVE-2016-2555

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 80%
CISA-KEV: Not listedEPSS: 80%CVSS: 9.8Exploit: NoneExposed: 0

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

SQL injection vulnerability in include/lib/mysql_connect.inc.php in ATutor 2.2.1 allows remote attackers to execute arbitrary SQL commands via the searchFriends function to friends.inc.php.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
99.6%
KEV
Not listed

Published

April 13, 2017

Last Modified

May 13, 2026

Advisory Details (4)

Auto-updated Jun 24, 2026
Patch available. Sources: github_commit.
github_commit Patch Available

commit 945a9dca01de (atutor/ATutor)

Patch available: atutor/ATutor atutor_2_2_2 (contains commit 945a9dca01de)

https://github.com/atutor/ATutor/commit/945a9dca01def8536516088da30fe6a4b7e9fa85
github_commit Patch Available

commit 629b2c992447 (atutor/ATutor)

Patch available: atutor/ATutor atutor_2_2_2 (contains commit 629b2c992447)

https://github.com/atutor/ATutor/commit/629b2c992447f7670a2fecc484abfad8c4c2d298
generic

Rapid7 Vulnerability Database

http://www.rapid7.com/db/modules/exploit/multi/http/atutor_sqli
generic🟡 PoC Available

ATutor 2.2.1 - SQL Injection / Remote Code Execution (Metasploit) - PHP remote Exploit

https://www.exploit-db.com/exploits/39514/

Data Freshness Timeline

(refreshed 3× in last 7d / 18× 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.

  1. 2026-07-06 02:20 UTCEPSS rescore
  2. 2026-07-06 02:20 UTCEPSS rescore
  3. 2026-06-30 23:19 UTCEPSS rescore
  4. 2026-06-27 03:05 UTCEPSS rescore
  5. 2026-06-27 03:05 UTCEPSS rescore
  6. 2026-06-25 13:47 UTCEPSS rescore
  7. 2026-06-25 13:47 UTCEPSS rescore
  8. 2026-06-23 21:30 UTCEPSS rescore
  9. 2026-06-19 21:06 UTCOSV refresh
  10. 2026-06-17 17:50 UTCEPSS rescore
  11. 2026-06-17 17:50 UTCEPSS rescore
  12. 2026-06-16 17:50 UTCEPSS rescore
  13. 2026-06-16 17:50 UTCEPSS rescore
  14. 2026-06-15 17:45 UTCEPSS rescore
  15. 2026-06-12 23:09 UTCEPSS rescore
  16. 2026-06-12 23:09 UTCEPSS rescore
  17. 2026-06-11 13:57 UTCEPSS rescore
  18. 2026-06-10 22:15 UTCEPSS rescore
  19. 2026-06-07 15:22 UTCEPSS rescore
  20. 2026-06-07 15:22 UTCEPSS rescore
  21. 2026-06-06 13:45 UTCEPSS rescore
  22. 2026-06-05 22:44 UTCEPSS rescore
  23. 2026-06-05 06:08 UTCEPSS rescore
  24. 2026-06-05 06:08 UTCEPSS rescore
  25. 2026-05-31 00:55 UTCOSV refresh
Show 33 more
  1. 2026-05-31 00:14 UTCEPSS rescore
  2. 2026-05-28 13:42 UTCEPSS rescore
  3. 2026-05-28 13:42 UTCEPSS rescore
  4. 2026-05-27 13:38 UTCEPSS rescore
  5. 2026-05-27 13:38 UTCEPSS rescore
  6. 2026-05-26 07:16 UTCEPSS rescore
  7. 2026-05-24 16:43 UTCEPSS rescore
  8. 2026-05-22 21:15 UTCEPSS rescore
  9. 2026-05-22 21:15 UTCEPSS rescore
  10. 2026-05-20 22:37 UTCEPSS rescore
  11. 2026-05-20 22:37 UTCEPSS rescore
  12. 2026-05-20 22:37 UTCEPSS rescore
  13. 2026-05-20 10:07 UTCEG score recompute
  14. 2026-05-20 10:07 UTCGHSA enrichment
  15. 2026-05-20 06:19 UTCEG score recompute
  16. 2026-05-20 06:19 UTCGHSA enrichment
  17. 2026-05-20 02:31 UTCEG score recompute
  18. 2026-05-20 02:31 UTCGHSA enrichment
  19. 2026-05-19 22:42 UTCEG score recompute
  20. 2026-05-19 22:42 UTCGHSA enrichment
  21. 2026-05-19 18:54 UTCEG score recompute
  22. 2026-05-19 18:54 UTCGHSA enrichment
  23. 2026-05-19 15:06 UTCEG score recompute
  24. 2026-05-19 15:06 UTCGHSA enrichment
  25. 2026-05-19 11:18 UTCEG score recompute
  26. 2026-05-19 11:17 UTCGHSA enrichment
  27. 2026-05-19 07:17 UTCEG score recompute
  28. 2026-05-19 07:17 UTCGHSA enrichment
  29. 2026-05-19 03:29 UTCEG score recompute
  30. 2026-05-19 03:29 UTCGHSA enrichment
  31. 2026-05-18 23:40 UTCEG score recompute
  32. 2026-05-18 21:30 UTCEPSS rescore
  33. 2026-05-18 21:30 UTCEPSS rescore

Publicly available exploits

(4 references)

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

  • GitHub PoCshadofren/CVE-2016-2555
    First seen Aug 9, 2020

    CVE-2016-2555

    Open source ↗
  • Exploit-DBEDB-39514✓ verified
    First seen Mar 1, 2016

    ATutor 2.2.1 - SQL Injection / Remote Code Execution (Metasploit)

    Open source ↗
  • Metasploitexploit/multi/http/atutor_sqli✓ verified
    First seen Mar 1, 2016

    ATutor 2.2.1 SQL Injection / Remote Code Execution

    Open source ↗
  • Metasploitexploit/linux/http/atutor_filemanager_traversal✓ verified
    First seen Mar 1, 2016

    ATutor 2.2.1 Directory Traversal / Remote Code Execution

    Open source ↗

Frequently asked(5)

What is CVE-2016-2555?
CVE-2016-2555 is a critical vulnerability published on April 13, 2017. SQL injection vulnerability in include/lib/mysql_connect.inc.php in ATutor 2.2.1 allows remote attackers to execute arbitrary SQL commands via the searchFriends function to friends.inc.php.
When was CVE-2016-2555 disclosed?
CVE-2016-2555 was first published in the National Vulnerability Database on April 13, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-2555 actively exploited?
CVE-2016-2555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-2555?
CVE-2016-2555 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-2555?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-2555, 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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