Security readout for executives and security teams
Plain-English summary
This issue affects ASUS RT-AC68U routers running firmware before 3.0.0.4.386.41634. A remote, unauthenticated attacker could use a SQL injection flaw in Cloud Disk to read sensitive information, specifically including /etc/shadow. The main business risk is credential disclosure from exposed or poorly segmented routers.
Executive priority
Treat this as a high-priority edge-device confidentiality risk. Internet-adjacent routers are difficult to monitor, and exposure could reveal password hash data. Prioritize firmware updates and access restrictions for any ASUS RT-AC68U still in use.
Technical view
CVE-2021-37316 is a CWE-89 SQL injection in the Cloud Disk feature of ASUS RT-AC68U firmware before 3.0.0.4.386.41634. CVSS 3.1 is 7.5, network reachable, low complexity, no privileges, no user interaction, with high confidentiality impact and no stated integrity or availability impact.
Likely exposure
Exposure is most likely where ASUS RT-AC68U routers run affected firmware and Cloud Disk is enabled or reachable from untrusted networks. The source bundle does not provide a complete affected CPE list, so inventory confirmation is necessary.
Exploitation context
The bundle does not indicate CISA KEV listing or active exploitation. The public reference is a vulnerability write-up, and the CVE description states remote attackers can view sensitive information via /etc/shadow. No exploit status beyond that is supported here.
Researcher notes
Evidence is limited to the CVE metadata and one public write-up reference. The source bundle names ASUS RT-AC68U firmware before 3.0.0.4.386.41634, but the affected structured field is not populated. Avoid broadening scope to other ASUS models without vendor confirmation.
Mitigation direction
- Inventory ASUS RT-AC68U routers and record firmware versions.
- Upgrade affected routers to 3.0.0.4.386.41634 or later, following ASUS guidance.
- Restrict Cloud Disk and router services from untrusted networks.
- Disable Cloud Disk where it is not operationally required.
- Rotate relevant credentials after remediation if exposure is suspected.
Validation and detection
- Confirm each ASUS RT-AC68U runs firmware 3.0.0.4.386.41634 or later.
- Verify Cloud Disk is disabled or only reachable from trusted networks.
- Check firewall rules for unintended WAN access to router services.
- Review router logs for suspicious Cloud Disk access where logs are available.
- Document any devices that cannot be updated and compensating controls applied.
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-89: Database access and collection lookup
Injection into data stores can inform collection, data access, and exfiltration detection reviews. 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 lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-37316 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://robertchen.cc/blog/2021/03/31/asus-rceCVE 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.
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.