Security readout for executives and security teams
Plain-English summary
This vulnerability can let an attacker bypass authentication in Xi S&D smarthome smartcare systems, exposing information and potentially allowing control of home environment functions. The source does not identify exact affected versions or a named patch, so owners should verify vendor guidance before assuming they are safe.
Executive priority
Treat this as high priority where affected smart home systems control physical environments. The main urgency is preventing unauthorized control and information exposure while confirming vendor-specific update status.
Technical view
CVE-2021-26638 is a CWE-287 improper authentication flaw in S&D smarthome smartcare. CVSS 3.1 is 7.3 high, with adjacent-network attack vector, low complexity, low privileges, no user interaction, and high confidentiality and integrity impact. Availability impact is not reported.
Likely exposure
Exposure is limited to environments using Xi S&D Inc. S&D smarthome smartcare systems. Version information is unspecified. The CVSS vector indicates adjacent-network reach and low privileges, so local network or comparable access should be treated as relevant.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. The CVE description says remote attackers can bypass authentication and take control of home environment functions, but public evidence in the bundle is sparse.
Researcher notes
The public bundle names the product family but not fixed versions, affected version ranges, or exploit details. Validation should focus on asset discovery, network reachability, authentication boundary review, and vendor advisory correlation without relying on assumed patch names.
Mitigation direction
- Check Xi S&D or KRCERT guidance for affected versions and updates.
- Restrict wallpad and smartcare access to trusted local networks only.
- Remove unnecessary remote access paths to smart home control interfaces.
- Limit low-privileged accounts and review who can access the system.
- Monitor vendor advisories because patch details are not provided here.
Validation and detection
- Inventory S&D smarthome smartcare deployments and wallpad installations.
- Compare installed product details against Xi S&D or KRCERT advisory information.
- Confirm control interfaces are not reachable from untrusted networks.
- Review accounts for unnecessary low-privileged access.
- Check logs for unusual smartcare access or configuration changes.
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-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-26638 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
- High
- CVSS
- 7.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N2.15.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66783CVE 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.