Deserialization in Sitecore Experience_platform
CVE-2021-42237
Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. No authentication or special configuration is required…
Vulnerability class: Insecure Deserialization
EPSS: 0.979 (99.9th 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
- Sitecore Experience_platform — versions 7.5, 8.0, 8.1
- N/a — versions n/a
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
References
- af854a3a-2127-422b-91ae-364da2661108 (x_refsource_MISC, Vendor Advisory)
- cve@mitre.org (x_refsource_MISC, Vendor Advisory)
- cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (VDB Entry, Third Party Advisory, x_refsource_MISC)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2021-42237?
- CVE-2021-42237 is a critical-severity vulnerability in Sitecore Experience_platform, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-11-05.
- How severe is CVE-2021-42237?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-42237 known to be exploited?
- Yes. CVE-2021-42237 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), indicating it is being actively exploited. 21 public proof-of-concept repositories are indexed.