Security readout for executives and security teams
Plain-English summary
CVE-2021-27769 is a medium-severity information disclosure issue in HCL Sametime 11.6. A remote unauthenticated attacker could obtain limited information that may help further attacks. The CVE does not indicate data compromise, integrity loss, service disruption, or active exploitation.
Executive priority
Prioritize during normal vulnerability remediation cycles, faster if Sametime is internet-facing or supports sensitive business communications. The issue is not described as actively exploited, but it can assist attackers in planning later intrusion attempts.
Technical view
The issue is categorized as CWE-472 and scored CVSS 3.1 5.3 with vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. The impact is limited to confidentiality. The public bundle identifies only HCL Sametime version 11.6 as affected and references HCL advisory KB0097430.
Likely exposure
Organizations running HCL Sametime 11.6 are the relevant exposure group. Risk is higher where Sametime services are reachable from untrusted networks, because the CVSS vector indicates network access, low complexity, no privileges, and no user interaction.
Exploitation context
The supplied sources do not report known active exploitation, and the CVE is not listed as CISA KEV. Treat this as reconnaissance-enabling exposure rather than a direct breach indicator based on the available evidence.
Researcher notes
Evidence is narrow: the bundle gives affected product/version, CVSS vector, CWE, and an HCL advisory link, but no detailed vulnerable endpoint, patch version, or exploitation evidence. Avoid assuming broader HCL product exposure without vendor confirmation.
Mitigation direction
- Identify whether HCL Sametime 11.6 exists in production or externally reachable environments.
- Review HCL advisory KB0097430 for vendor remediation or fixed-version guidance.
- Apply the vendor-supported update or configuration change if HCL provides one.
- Restrict untrusted network access to Sametime services where business requirements allow.
- Review exposed service responses for unnecessary version, path, or configuration details.
Validation and detection
- Confirm Sametime versions through approved asset inventory or administrative records.
- Check whether affected Sametime endpoints are reachable from the internet or partner networks.
- Review HCL KB0097430 and record the applicable remediation status.
- Verify that vendor-recommended remediation has been applied in affected environments.
- Monitor logs for unusual reconnaissance against Sametime-facing endpoints.
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-472: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2021-27769 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://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0097430CVE 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.
External Control of Assumed-Immutable Web Parameter
External Control of Assumed-Immutable Web Parameter represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.