php: changes to is_a() in 5.3.7 may allow arbitrary code execution with certain code
Published Nov 3, 2011
7.5
HIGHCVSS 2.0
EPSS 5.01%
Description
The is_a function in PHP 5.3.7 and 5.3.8 triggers a call to the __autoload function, which makes it easier for remote attackers to execute arbitrary code by providing a crafted URL and leveraging potentially unsafe behavior in certain PEAR packages and custom autoloaders.
Affected products
No data.
No data.
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 |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of php as shipped with Red Hat Enterprise Linux 4, 5, or 6.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
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 (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 5.01% (0.05010) | 91.98th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.07% (0.05074) | 91.21th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.08% (0.01085) | 76.34th | v4 (v2025.03.14) |
| Dec 12, 2024 | 6.02% (0.06019) | 93.77th | v3 (v2023.03.01) |
| Jun 23, 2024 | 6.02% (0.06019) | 93.53th | v3 (v2023.03.01) |
| May 3, 2024 | 5.40% (0.05401) | 93.09th | v3 (v2023.03.01) |
| Nov 22, 2023 | 5.00% (0.05003) | 92.02th | v3 (v2023.03.01) |
| Mar 31, 2023 | 5.99% (0.05990) | 92.31th | v3 (v2023.03.01) |
| Mar 7, 2023 | 6.24% (0.06244) | 92.43th | v3 (v2023.03.01) |
| Mar 6, 2023 | 8.26% (0.08263) | 93.54th | v2 (v2022.01.01) |
| Apr 1, 2022 | 8.26% (0.08263) | 92.94th | v2 (v2022.01.01) |
| Feb 4, 2022 | 8.26% (0.08263) | 82.29th | v2 (v2022.01.01) |
References (10)
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041 vendor-advisoryx_refsource_HP
- http://securityreason.com/securityalert/8525 third-party-advisoryx_refsource_SREASON
- http://svn.php.net/viewvc/?view=revision&revision=317183 x_refsource_CONFIRMPatch
- http://www.byte.nl/blog/2011/09/23/security-bug-in-is_a-function-in-php-5-3-7-5-3-8/ x_refsource_MISCExploit
- http://www.securityfocus.com/archive/1/519770/30/0/threaded mailing-listx_refsource_BUGTRAQ
- https://access.redhat.com/security/cve/CVE-2011-3379 Vendor Advisory
- https://bugs.php.net/bug.php?id=55475 x_refsource_CONFIRMExploit
- https://bugzilla.redhat.com/show_bug.cgi?id=741020 x_refsource_CONFIRMPatchIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2011-3379
- https://www.cve.org/CVERecord?id=CVE-2011-3379
| Link | Providers | Tags |
|---|---|---|
| http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041 | vendor-advisoryx_refsource_HP | |
| http://securityreason.com/securityalert/8525 | third-party-advisoryx_refsource_SREASON | |
| http://svn.php.net/viewvc/?view=revision&revision=317183 | x_refsource_CONFIRMPatch | |
| http://www.byte.nl/blog/2011/09/23/security-bug-in-is_a-function-in-php-5-3-7-5-3-8/ | x_refsource_MISCExploit | |
| http://www.securityfocus.com/archive/1/519770/30/0/threaded | mailing-listx_refsource_BUGTRAQ | |
| https://access.redhat.com/security/cve/CVE-2011-3379 | Vendor Advisory | |
| https://bugs.php.net/bug.php?id=55475 | x_refsource_CONFIRMExploit | |
| https://bugzilla.redhat.com/show_bug.cgi?id=741020 | x_refsource_CONFIRMPatchIssue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-3379 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-3379 |
Change history (0)
No recorded changes yet.