Integer overflow in Parallels Desktop
CVE-2021-27259
This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.0.1-48919. An attacker must first obtain the ability to execute low-privileged code on the target guest system in order to exploit this vulnerability. The specific flaw exists within the Toolgate component. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before allocating a buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. Was ZDI-CAN-12021.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (36.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Parallels Desktop — versions 16.0.1-48919
- Parallels Desktop — versions 16.0.1
Weakness classification (CWE)
References
- kb.parallels.com/en/125013 (Release Notes, Vendor Advisory)
- www.zerodayinitiative.com/advisories/ZDI-21-212/ (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-27259?
- CVE-2021-27259 is a high-severity vulnerability in Parallels Desktop, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2021-04-14.
- How severe is CVE-2021-27259?
- High severity. CVSS v3 base score is 7.8 out of 10.