Security readout for executives and security teams
Plain-English summary
CVE-2023-38327 is a user enumeration issue in eGroupWare 17.1.20190111. An unauthenticated remote attacker can distinguish valid application users through different server responses from calendar/freebusy.php. This does not provide direct system access, but it can help attackers build accurate target lists for phishing, credential attacks, or follow-on intrusion attempts.
Executive priority
Treat this as a moderate-priority exposure issue, not an emergency based on the provided evidence. Prioritize externally reachable systems because user enumeration can materially improve targeted attacks, especially against executives, administrators, and customer-facing accounts.
Technical view
The CVE describes CWE-203 observable discrepancy behavior in eGroupWare 17.1.20190111 under calendar/freebusy.php. The CVSS 3.1 score is 5.3: network reachable, low complexity, no privileges or user interaction required, with low confidentiality impact and no integrity or availability impact reported.
Likely exposure
Exposure is most relevant where eGroupWare 17.1.20190111 is deployed and calendar/freebusy.php is reachable from untrusted networks. The source bundle does not identify affected CPEs, other versions, deployment patterns, or vendor-confirmed fixed versions.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV in the bundle. The issue is still useful to attackers because reliable account discovery can reduce guesswork before credential stuffing, phishing, or social engineering campaigns.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, CWE-203 classification, and one external reference. The affected metadata in the bundle is incomplete, listing vendor and product as n/a despite the description naming eGroupWare 17.1.20190111.
Mitigation direction
- Check eGroupWare vendor guidance for affected versions and fixed releases.
- Restrict public access to calendar/freebusy.php where business requirements allow.
- Move exposed eGroupWare instances behind authentication or trusted network controls.
- Monitor application logs for unusual unauthenticated freebusy lookup patterns.
- Retire or upgrade eGroupWare 17.1.20190111 if vendor guidance confirms it is vulnerable.
Validation and detection
- Inventory internet-facing and internal eGroupWare deployments and record exact versions.
- Confirm whether calendar/freebusy.php is reachable without authentication.
- Review logs for repeated unauthenticated requests targeting freebusy functionality.
- Check vendor or project advisories for fixed versions and recommended configuration changes.
- Document whether exposed instances contain sensitive user directories or high-risk accounts.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-203: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2023-38327 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.gruppotim.it/it/footer/red-team.htmlCVE reference
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.
Observable Discrepancy
Observable Discrepancy represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.