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TI-2021-18687 Aliases CVE-2021-42237GHSA-j3x5-fr4h-9v7v

Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure…

Priority CRITICAL 100Exploited in the wildCWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-502.

Summary

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 to exploit this vulnerability.

Why it matters now

Exploitation Active In CISA KEV since 2022-03-25CISA due date 2022-04-15Known ransomware use
EPSS 0.97566 99th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 24

CPEVersionsRoleVendor
cpe:2.3:a:sitecore:experience_platform:7.5:-:*:*:*:*:*:*7.5VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:7.5:update1:*:*:*:*:*:*7.5 update1VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:7.5:update2:*:*:*:*:*:*7.5 update2VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.0:-:*:*:*:*:*:*8.0VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.0:sp1:*:*:*:*:*:*8.0 sp1VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.0:update1:*:*:*:*:*:*8.0 update1VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.0:update2:*:*:*:*:*:*8.0 update2VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.0:update3:*:*:*:*:*:*8.0 update3VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.0:update4:*:*:*:*:*:*8.0 update4VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.0:update5:*:*:*:*:*:*8.0 update5VulnerableSitecore
  • cpe:2.3:a:sitecore:experience_platform:7.5:-:*:*:*:*:*:* Versions 7.5 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:7.5:update1:*:*:*:*:*:* Versions 7.5 update1 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:7.5:update2:*:*:*:*:*:* Versions 7.5 update2 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.0:-:*:*:*:*:*:* Versions 8.0 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.0:sp1:*:*:*:*:*:* Versions 8.0 sp1 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.0:update1:*:*:*:*:*:* Versions 8.0 update1 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.0:update2:*:*:*:*:*:* Versions 8.0 update2 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.0:update3:*:*:*:*:*:* Versions 8.0 update3 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.0:update4:*:*:*:*:*:* Versions 8.0 update4 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.0:update5:*:*:*:*:*:* Versions 8.0 update5 Vulnerable ·Sitecore
Show 14 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:sitecore:experience_platform:8.0:update6:*:*:*:*:*:*8.0 update6VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.0:update7:*:*:*:*:*:*8.0 update7VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.1:-:*:*:*:*:*:*8.1VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.1:update1:*:*:*:*:*:*8.1 update1VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.1:update2:*:*:*:*:*:*8.1 update2VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.1:update3:*:*:*:*:*:*8.1 update3VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.2:-:*:*:*:*:*:*8.2VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.2:update1:*:*:*:*:*:*8.2 update1VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.2:update2:*:*:*:*:*:*8.2 update2VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.2:update3:*:*:*:*:*:*8.2 update3VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.2:update4:*:*:*:*:*:*8.2 update4VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.2:update5:*:*:*:*:*:*8.2 update5VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.2:update6:*:*:*:*:*:*8.2 update6VulnerableSitecore
cpe:2.3:a:sitecore:experience_platform:8.2:update7:*:*:*:*:*:*8.2 update7VulnerableSitecore
  • cpe:2.3:a:sitecore:experience_platform:8.0:update6:*:*:*:*:*:* Versions 8.0 update6 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.0:update7:*:*:*:*:*:* Versions 8.0 update7 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.1:-:*:*:*:*:*:* Versions 8.1 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.1:update1:*:*:*:*:*:* Versions 8.1 update1 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.1:update2:*:*:*:*:*:* Versions 8.1 update2 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.1:update3:*:*:*:*:*:* Versions 8.1 update3 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.2:-:*:*:*:*:*:* Versions 8.2 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.2:update1:*:*:*:*:*:* Versions 8.2 update1 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.2:update2:*:*:*:*:*:* Versions 8.2 update2 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.2:update3:*:*:*:*:*:* Versions 8.2 update3 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.2:update4:*:*:*:*:*:* Versions 8.2 update4 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.2:update5:*:*:*:*:*:* Versions 8.2 update5 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.2:update6:*:*:*:*:*:* Versions 8.2 update6 Vulnerable ·Sitecore
  • cpe:2.3:a:sitecore:experience_platform:8.2:update7:*:*:*:*:*:* Versions 8.2 update7 Vulnerable ·Sitecore

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2022-03-25 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2021-42237
  3. 2026-10-03 Alias added: GHSA-j3x5-fr4h-9v7v

References

Exploit 1

Advisory 2

  • TI-2019-07254 Deserialization of Untrusted Data in the Sitecore.Security.AntiCSRF (aka anti CSRF)… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-33607 Sitecore Products ViewState Deserialization Vulnerability KEVCVSS 3.1CRITICAL 9.0
  • TI-2023-17897 Multiple Sitecore products allow remote code execution. CVSS 3.1CRITICAL 9.8
  • TI-2025-33610 HTML Cache Poisoning through Unsafe Reflections CVSS 3.1CRITICAL 9.8
  • TI-2023-11899 Deserialization of Untrusted Data in Sitecore Experience Platform through 10.2 allows… CVSS 3.1CRITICAL 9.8
  • TI-2025-24533 Sitecore XM and XP Hardcoded Credentials CVSS 3.1HIGH 7.5
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences