Vulnerability in Thephpleague Flysystem
CVE-2021-32708
Flysystem is an open source file storage library for PHP. The whitespace normalisation using in 1.x and 2.x removes any unicode whitespace. Under certain specific conditions this could potentially allow a malicious user to execute code rem…
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
EPSS: 0.035 (87.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Thephpleague Flysystem — versions < 1.1.4, >= 2.0.0, < 2.1.1
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Product, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (x_refsource_FEDORA, vendor-advisory)
- security-advisories@github.com (x_refsource_FEDORA, vendor-advisory)
Frequently asked questions
- What is CVE-2021-32708?
- CVE-2021-32708 is a critical-severity vulnerability in Thephpleague Flysystem, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 9.8/10. Published 2021-06-24.
- How severe is CVE-2021-32708?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-32708 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.