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CVE-2011-1938: Stack-based buffer overflow in the socket_connect function in ext/sockets/sockets.c in PHP 5.3.3 through 5.3.6 might allow context-dependent…

HighCVSS 7.5 · v2.0—Proof of concept Fix available

Noroxi assessment

Priority: Monitor (action score 37/100)

  • Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 23.1% (FIRST EPSS); higher than 97.7% of all records.
  • No special conditions are required; it is repeatable.
  • Fixed version: php5 (Debian:5.0) 5.2.6.dfsg.1-1+lenny14; php5 (Debian:6.0) 5.3.3-7+squeeze5; php53 (Red Hat:enterprise_linux:5::client_workstation) 0:5.3.3-1.el5_7.3.

Low priority for now. Upgrade to php5 (Debian:5.0) 5.2.6.dfsg.1-1+lenny14; php5 (Debian:6.0) 5.3.3-7+squeeze5; php53 (Red Hat:enterprise_linux:5::client_workstation) 0:5.3.3-1.el5_7.3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Stack-based buffer overflow in the socket_connect function in ext/sockets/sockets.c in PHP 5.3.3 through 5.3.6 might allow context-dependent attackers to execute arbitrary code via a long pathname for a UNIX socket.

Published
May 31, 2011
Updated
Jun 16, 2026
EPSS
23.1% · 97th percentile

Report tools

JSON

Action score

37

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
7 / 30 · 23.1%

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  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
phpphp

Using php? Add it to your stack and be the first to know about CVEs like this one. (PHP)

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When you'll hear from us

  • when a new CVE affecting this product is published
  • when a record in your stack enters KEV or is weaponized

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • php php5.3.3
  • php php5.3.4
  • php php5.3.5
  • php php5.3.6

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:5.0php5before 5.2.6.dfsg.1-1+lenny145.2.6.dfsg.1-1+lenny14
Debian:6.0php5before 5.3.3-7+squeeze55.3.3-7+squeeze5
Red Hat:enterprise_linux:5::client_workstationphp53before 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-bcmathbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-clibefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-commonbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-dbabefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-debuginfobefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-develbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-gdbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-imapbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-intlbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-ldapbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-mbstringbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-mysqlbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-odbcbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-pdobefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-pgsqlbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-processbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-pspellbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-snmpbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-soapbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-xmlbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3
Red Hat:enterprise_linux:5::client_workstationphp53-xmlrpcbefore 0:5.3.3-1.el5_7.30:5.3.3-1.el5_7.3

+27

Same product

php: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-4577Argument Injection in PHP-CGIKEV
    99Now
  • CVE-2019-11043Underflow in PHP-FPM can lead to RCEKEV
    99Now
  • CVE-2012-1823sapi/cgi/cgi_main.c in PHP before 5.3.12 and 5.4.x before 5.4.2, when configured as a CGI script (aka php-cgi), does not properly handle…KEV
    99Now

Published before and after this one in the same product

  • ← EarlierCVE-2011-1471Mar 19, 2011 · Integer signedness error in zip_stream.c in the Zip extension in PHP before 5.3.6 allows context-dependent attackers to cause a denial of…
    21Monitor
  • ← EarlierCVE-2011-0441Mar 29, 2011 · The Debian GNU/Linux /etc/cron.d/php5 cron job for PHP 5.3.5 allows local users to delete arbitrary files via a symlink attack on a…
    25Monitor
  • Later →CVE-2011-2202Jun 16, 2011 · The rfc1867_post_handler function in main/rfc1867.c in PHP before 5.3.7 does not properly restrict filenames in multipart/form-data POST…
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:php55.3.3-7+squeeze5 · Debian:6.0Package registry (OSV)
red hat:php530:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:php53-bcmath0:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:php53-cli0:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:php53-common0:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:php53-dba0:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:php53-debuginfo0:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:php53-devel0:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:php53-gd0:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:php53-imap0:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:php53-intl0:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:php53-ldap0:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:php53-mbstring0:5.3.3-1.el5_7.3 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrylocal2011-05-25
Exploit-DB entrylocal2011-07-04

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-7 d
  2. Published
  3. TodayNov 15, 2026+5647 d

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
P · data can be read
Integrity
P · data or configuration can be modified
Availability
P · the service can be disrupted
Attack complexity
Low
Confidentiality impact
P
Integrity impact
P
Availability impact
P

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (16 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records