CVE-2011-0755 — php: mt_rand() does not check that max is greater than min

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MEDIUM

php: mt_rand() does not check that max is greater than min

Published Feb 2, 2011

5.0

MEDIUM

CVSS 2.0

EPSS 1.94%

Description

Integer overflow in the mt_rand function in PHP before 5.3.4 might make it easier for context-dependent attackers to predict the return values by leveraging a script's use of a large max parameter, as demonstrated by a value that exceeds mt_getrandmax.

Affected products

PHP / PHP Application

≤ 5.3.3
PHP / PHP Application

1.0
PHP / PHP Application

2.0
PHP / PHP Application

2.0b10
PHP / PHP Application

3.0
PHP / PHP Application

3.0.1
PHP / PHP Application

3.0.2
PHP / PHP Application

3.0.3
PHP / PHP Application

3.0.4
PHP / PHP Application

3.0.5
PHP / PHP Application

3.0.6
PHP / PHP Application

3.0.7
PHP / PHP Application

3.0.8
PHP / PHP Application

3.0.9
PHP / PHP Application

3.0.10
PHP / PHP Application

3.0.11
PHP / PHP Application

3.0.12
PHP / PHP Application

3.0.13
PHP / PHP Application

3.0.14
PHP / PHP Application

3.0.15
PHP / PHP Application

3.0.16
PHP / PHP Application

3.0.17
PHP / PHP Application

3.0.18
PHP / PHP Application

4.0
PHP / PHP Application

4.0
PHP / PHP Application

4.0
PHP / PHP Application

4.0
PHP / PHP Application

4.0
PHP / PHP Application

4.0
PHP / PHP Application

4.0.0
PHP / PHP Application

4.0.1
PHP / PHP Application

4.0.2
PHP / PHP Application

4.0.3
PHP / PHP Application

4.0.4
PHP / PHP Application

4.0.5
PHP / PHP Application

4.0.6
PHP / PHP Application

4.0.7
PHP / PHP Application

4.1.0
PHP / PHP Application

4.1.1
PHP / PHP Application

4.1.2
PHP / PHP Application

4.2.0
PHP / PHP Application

4.2.1
PHP / PHP Application

4.2.2
PHP / PHP Application

4.2.3
PHP / PHP Application

4.3.0
PHP / PHP Application

4.3.1
PHP / PHP Application

4.3.2
PHP / PHP Application

4.3.3
PHP / PHP Application

4.3.4
PHP / PHP Application

4.3.5
PHP / PHP Application

4.3.6
PHP / PHP Application

4.3.7
PHP / PHP Application

4.3.8
PHP / PHP Application

4.3.9
PHP / PHP Application

4.3.10
PHP / PHP Application

4.3.11
PHP / PHP Application

4.4.0
PHP / PHP Application

4.4.1
PHP / PHP Application

4.4.2
PHP / PHP Application

4.4.3
PHP / PHP Application

4.4.4
PHP / PHP Application

4.4.5
PHP / PHP Application

4.4.6
PHP / PHP Application

4.4.7
PHP / PHP Application

4.4.8
PHP / PHP Application

4.4.9
PHP / PHP Application

5.0.0
PHP / PHP Application

5.0.0
PHP / PHP Application

5.0.0
PHP / PHP Application

5.0.0
PHP / PHP Application

5.0.0
PHP / PHP Application

5.0.0
PHP / PHP Application

5.0.0
PHP / PHP Application

5.0.0
PHP / PHP Application

5.0.1
PHP / PHP Application

5.0.2
PHP / PHP Application

5.0.3
PHP / PHP Application

5.0.4
PHP / PHP Application

5.0.5
PHP / PHP Application

5.1.0
PHP / PHP Application

5.1.1
PHP / PHP Application

5.1.2
PHP / PHP Application

5.1.3
PHP / PHP Application

5.1.4
PHP / PHP Application

5.1.5
PHP / PHP Application

5.1.6
PHP / PHP Application

5.2.0
PHP / PHP Application

5.2.1
PHP / PHP Application

5.2.2
PHP / PHP Application

5.2.3
PHP / PHP Application

5.2.4
PHP / PHP Application

5.2.4
PHP / PHP Application

5.2.5
PHP / PHP Application

5.2.6
PHP / PHP Application

5.2.7
PHP / PHP Application

5.2.8
PHP / PHP Application

5.2.9
PHP / PHP Application

5.2.10
PHP / PHP Application

5.2.11
PHP / PHP Application

5.2.12
PHP / PHP Application

5.2.13
PHP / PHP Application

5.2.14
PHP / PHP Application

5.2.15
PHP / PHP Application

5.2.16
PHP / PHP Application

5.2.17
PHP / PHP Application

5.3.0
PHP / PHP Application

5.3.1
PHP / PHP Application

5.3.2

Red Hat Enterprise Linux 4

php

Not affected
Red Hat Enterprise Linux 5

php

Not affected
Red Hat Enterprise Linux 5

php53

Not affected
Red Hat Enterprise Linux 6

php

Not affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 4	php	Not affected	n/a
Red Hat Enterprise Linux 5	php	Not affected	n/a
Red Hat Enterprise Linux 5	php53	Not affected	n/a
Red Hat Enterprise Linux 6	php	Not affected	n/a

Remediation

Red Hat statement

Red Hat does not consider this flaw to be a security issue as arguments passed to the mt_rand function are under the full control of the script author. No trust boundary is crossed. This flaw exists in the php53 packages versions as shipped in Red Hat Enterprise Linux 5 and the php packages versions as shipped in Red Hat Enterprise Linux 6.

Metrics

1.94% 0.01937

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01937

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.94% (0.01937)	79.35th	v5 (v2026.06.15)
Jun 15, 2026	1.94% (0.01937)	77.38th	v5 (v2026.06.15)
Mar 17, 2025	0.41% (0.00408)	59.05th	v4 (v2025.03.14)
Dec 12, 2024	0.18% (0.00180)	56.56th	v3 (v2023.03.01)
Jun 20, 2024	0.18% (0.00180)	55.41th	v3 (v2023.03.01)
Mar 7, 2023	0.18% (0.00180)	53.40th	v3 (v2023.03.01)
Mar 6, 2023	1.02% (0.01018)	40.69th	v2 (v2022.01.01)
Sep 10, 2022	1.02% (0.01018)	38.88th	v2 (v2022.01.01)
Apr 1, 2022	1.02% (0.01018)	36.86th	v2 (v2022.01.01)
Feb 4, 2022	1.02% (0.01018)	19.50th	v2 (v2022.01.01)

Weaknesses (1)

CWE-189

References (8)

http://bugs.php.net/46587
x_refsource_CONFIRMExploit
http://www.php.net/ChangeLog-5.php
x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2011-0755
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=674709
Issue Tracking
https://exchange.xforce.ibmcloud.com/vulnerabilities/65426
vdb-entryx_refsource_XF
https://nvd.nist.gov/vuln/detail/CVE-2011-0755
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12589
vdb-entrysignaturex_refsource_OVAL
https://www.cve.org/CVERecord?id=CVE-2011-0755

Link	Providers	Tags
http://bugs.php.net/46587		x_refsource_CONFIRMExploit
http://www.php.net/ChangeLog-5.php		x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2011-0755		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=674709		Issue Tracking
https://exchange.xforce.ibmcloud.com/vulnerabilities/65426		vdb-entryx_refsource_XF
https://nvd.nist.gov/vuln/detail/CVE-2011-0755
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12589		vdb-entrysignaturex_refsource_OVAL
https://www.cve.org/CVERecord?id=CVE-2011-0755

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Feb 2, 2011

Updated Aug 6, 2024

Reserved Feb 2, 2011

Link CVE-2011-0755

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2011-0755

Red Hat

Severity n/a

Public date Nov 17, 2008

Links CVE-2011-0755 - Bugzilla