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CVE Record

CVE-2021-25630: "loolforkit" is a privileged program that is supposed to be run by a special, non-privileged "lool" user.

"loolforkit" is a privileged program that is supposed to be run by a special, non-privileged "lool" user. Before doing anything else "loolforkit" checks, if it was invoked by the "lool" user, and refuses to run with privileges, if it's not the case. In the vulnerable version of "loolforkit" this check was wrong, so a normal user could start "loolforkit" and eventually get local root privileges.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-25630 is a local privilege escalation flaw in the privileged loolforkit helper used by Collabora Online and LibreOffice Online. A normal local user could invoke it because its user check was wrong, potentially gaining root privileges. Business urgency is highest where affected software runs on shared hosts or hosts with untrusted local users.

Executive priority

Prioritize remediation on shared, internet-facing, or high-value document-service hosts. The main business risk is full host compromise after any local foothold, not remote compromise directly from the network based on the supplied sources.

Technical view

The issue is an incorrect caller validation in loolforkit, a privileged program intended to run only as the non-privileged lool user. The source bundle states vulnerable loolforkit versions could be started by a normal user and eventually lead to local root privileges. Listed affected versions include Collabora Online 4.2 and 6.4, plus unspecified LibreOffice Online.

Likely exposure

Exposure is limited to systems running affected Collabora Online or LibreOffice Online builds where an attacker can execute code or act as a normal local user. Public network exposure alone is not enough based on the supplied evidence.

Exploitation context

The bundle does not show CISA KEV listing or cited evidence of active exploitation. The vulnerability requires local execution context, but successful abuse could convert a low-privileged foothold into root on the affected host.

Researcher notes

Evidence is concise and does not include CVSS, CWE, exploit maturity, or exact fixed versions in the provided bundle. Treat this as a privileged helper caller-check failure enabling local root escalation, and avoid assuming broader remote impact without vendor evidence.

Mitigation direction

  • Inventory Collabora Online and LibreOffice Online hosts for affected versions.
  • Check the Collabora advisory and Openwall notice for vendor-supported fixed versions or workarounds.
  • Update affected installations according to vendor guidance.
  • Restrict untrusted local user access to affected hosts until remediation is complete.

Validation and detection

  • Confirm whether loolforkit is present on each relevant host.
  • Record installed Collabora Online or LibreOffice Online versions.
  • Verify whether deployments match the affected version ranges in the CVE bundle.
  • Review host access model for untrusted local users or low-privileged service footholds.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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-2021-25630 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Collabora ProductivityCollabora OnlineCollabora Online 4.2, Collabora Online 6.4Listed
The Document FoundationLibreOffice OnlineunspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.