How severe is CVE-2016-2555?

CVE-2016-2555 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-2555 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 80% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-2555?

CVE-2016-2555 affects Atutor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-2555?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2016-2555 published?

CVE-2016-2555 was published on 2017-04-13 and last updated on 2026-06-17.

CVE-2016-2555

CVE-2016-2555 is a critical-severity vulnerability in Atutor with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 80% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 80% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Atutor
Published: 2017-04-13
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2016-2555?: 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.
How severe is CVE-2016-2555?: CVE-2016-2555 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-2555 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 80% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-2555?: CVE-2016-2555 affects Atutor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-2555?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2016-2555 published?: CVE-2016-2555 was published on 2017-04-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:atutor:atutor:2.2.1:*:*:*:*:*:*:*

More vulnerabilities in Atutor

CVE-2014-9753 — Critical (CVSS 9.8): confirm.php in ATutor 2.2 and earlier allows remote attackers to bypass authentication and gain access as an existing…
CVE-2019-16114 — Critical (CVSS 9.8): In ATutor 2.2.4, an unauthenticated attacker can change the application settings and force it to use his crafted…
CVE-2017-1000004 — Critical (CVSS 9.8): ATutor version 2.2.1 and earlier are vulnerable to a SQL injection in the Assignment Dropbox, BasicLTI, Blog Post,…
CVE-2017-1000003 — Critical (CVSS 9.8): ATutor versions 2.2.1 and earlier are vulnerable to an incorrect access control check vulnerability in the Social…
CVE-2017-1000002 — Critical (CVSS 9.8): ATutor versions 2.2.1 and earlier are vulnerable to a directory traversal and file extension check bypass in the Course…
CVE-2015-1583 — High (CVSS 8.8): Multiple cross-site request forgery (CSRF) vulnerabilities in ATutor 2.2 allow remote attackers to hijack the…

All CVEs affecting Atutor →

Other CWE-89 (SQL Injection) vulnerabilities

CVE-2026-54350 — Critical (CVSS 10.0): Budibase is an open-source low-code platform. Prior to 3.39.12, an unauthenticated visitor of any published Budibase…
CVE-2026-8054 — Critical (CVSS 10.0): Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') in the Publish Audit API endpoints…
CVE-2026-42287 — Critical (CVSS 10.0): Emlog is an open source website building system. Prior to version 2.6.11, direct SQL injection in article creation and…
CVE-2026-3325 — Critical (CVSS 10.0): SQL injection (SQLi) in MegaCMS v12.0.0, specifically in the “id_territorio” parameter of the…
CVE-2025-10878 — Critical (CVSS 10.0): A SQL injection vulnerability exists in the login functionality of Fikir Odalari AdminPando 1.0.1 before 2026-01-26.…
CVE-2025-57792 — Critical (CVSS 10.0): Explorance Blue versions prior to 8.14.9 contain a SQL injection vulnerability caused by insufficient validation of…

Browse all CWE-89 (SQL Injection) vulnerabilities →