CVE-2015-9253: php Uncontrolled Resource Consumption
Vulnerability summary
CVE-2015-9253 is a medium (CVSS 6.8) Uncontrolled Resource Consumption vulnerability in php. EPSS estimates a 4.18% chance of exploitation in the next 30 days, higher than 90.9% of scored vulnerabilities. 4 public exploits are recorded.
Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 6 · Related 7Timeline
- 19-02-2018PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in PHP 7.3.x before 7.3.0alpha3, 7.2.x before 7.2.8, and before 7.1.20. The php-fpm master process restarts a child process in an endless loop when using program execution functions (e.g., passthru, exec, shell_exec, or system) with a non-blocking STDIN stream, causing this master process to consume 100% of the CPU, and consume disk space with a large volume of error logs, as demonstrated by an attack by a customer of a shared-hosting facility.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · AlpineEcosystem advisory · calculated6.5MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
4.18%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
No change 0.00 pp
From 4.18% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
4 foundPhp Src
Maturity: poc
Exploit Reference (bugs.php.net)
Maturity: unknown
Exploit Reference (bugs.php.net)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu3 products
- php5< 5.5.9+dfsg-1ubuntu4.29+esm10
- php7.0< 7.0.33-0ubuntu0.16.04.16+esm3
- php7.2< 7.2.10-0ubuntu0.18.04.1
Alpine1 product
- php7< 7.2.8-r0
Php1 product
- phpEOL< 7.1.20 | ≥ 7.2.0, < 7.2.8 | 7.3.0:alpha1 | 7.3.0:alpha2
3 vendors · 5 products
References
16 links- bugs.php.net/bug.php?id=73342https://github.com/php/php-src/pull/3287X Refsource CONFIRMExploitIssue TrackingVendor Advisory
- github.com/php/php-src/commit/69dee5c732fe982c82edb17d0dbc3e79a47748d8X Refsource CONFIRMPatchThird Party Advisory