How severe is CVE-2015-5267?

CVE-2015-5267 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2015-5267 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-5267?

CVE-2015-5267 primarily affects Moodle. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-5267?

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

When was CVE-2015-5267 published?

CVE-2015-5267 was published on 2016-02-22 and last updated on 2026-06-17.

CVE-2015-5267

CVE-2015-5267 is a high-severity vulnerability in Moodle with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Moodle
Published: 2016-02-22
Last modified: 2026-06-17

Description

lib/moodlelib.php in Moodle through 2.6.11, 2.7.x before 2.7.10, 2.8.x before 2.8.8, and 2.9.x before 2.9.2 relies on the PHP mt_rand function to implement the random_string and complex_random_string functions, which makes it easier for remote attackers to predict password-recovery tokens via a brute-force approach.

Frequently asked questions

What is CVE-2015-5267?: lib/moodlelib.php in Moodle through 2.6.11, 2.7.x before 2.7.10, 2.8.x before 2.8.8, and 2.9.x before 2.9.2 relies on the PHP mt_rand function to implement the random_string and complex_random_string functions, which makes it easier for remote attackers to predict password-recovery tokens via a brute-force approach.
How severe is CVE-2015-5267?: CVE-2015-5267 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2015-5267 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-5267?: CVE-2015-5267 primarily affects Moodle. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-5267?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2015-5267 published?: CVE-2015-5267 was published on 2016-02-22 and last updated on 2026-06-17.

References

Affected products (21)

cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.7.0:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.7.1:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.7.2:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.7.3:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.7.4:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.7.5:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.7.6:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.7.7:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.7.8:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.7.9:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.0:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.1:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.2:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.3:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.4:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.5:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.6:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.8.7:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.9.0:*:*:*:*:*:*:*
cpe:2.3:a:moodle:moodle:2.9.1:*:*:*:*:*:*:*

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