Security readout for executives and security teams
Plain-English summary
CVE-2021-27557 is a CSRF issue in EasyCorp ZenTao 12.5.3. If a logged-in user is tricked into visiting attacker-controlled content, the attacker may be able to change fields in the ZenTao Cron job tab. The business risk is unauthorized changes to scheduled jobs, with incomplete public detail on exact impact or fixes.
Executive priority
Treat this as a targeted application integrity risk, not a confirmed mass-exploitation emergency. Prioritize if ZenTao 12.5.3 supports operational workflows, is externally reachable, or has privileged users managing scheduled tasks.
Technical view
The CVE describes missing or insufficient CSRF protection around the ZenTao 12.5.3 Cron job tab, allowing attackers to update Cron job fields through a victim’s authenticated browser session. The source bundle does not provide CVSS, CWE, privilege requirements, request details, fixed versions, or vendor remediation text.
Likely exposure
Exposure is likely limited to organizations running EasyCorp ZenTao 12.5.3, especially internet-accessible or broadly reachable ZenTao instances where authenticated users can access Cron job management. The bundle does not identify other affected versions.
Exploitation context
The CVE is not listed as KEV, and the supplied sources do not prove active exploitation. A CSRF attack normally depends on social engineering a logged-in user. The cited research reference exists, but the bundle only substantiates unauthorized Cron job field updates for this CVE.
Researcher notes
Public metadata is sparse: no CVSS, CWE, exploit status, fixed version, or request-level details are included. Avoid assuming broader version impact or RCE from this CVE alone. Validate against ZenTao 12.5.3 and the vendor’s current remediation guidance.
Mitigation direction
- Check EasyCorp or ZenTao guidance for fixed versions and recommended remediation.
- Restrict ZenTao administrative and Cron job management access to trusted networks or VPN.
- Review Cron job settings for unauthorized or unexpected changes.
- Apply browser and session hardening where feasible, including strong SameSite cookie behavior.
- Train privileged ZenTao users to avoid untrusted links while authenticated.
Validation and detection
- Inventory ZenTao deployments and identify any running version 12.5.3.
- Confirm whether the Cron job tab is reachable from untrusted networks.
- Review application logs for unexpected Cron job field updates.
- Check vendor release notes or advisories for CSRF fixes affecting this area.
- Verify current CSRF protections are enabled on administrative forms.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2021-27557 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://privasec.com/blog/zentao-cms-a-monkeys-journey-to-priv-esc-remote-code-execution/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.