Security readout for executives and security teams
Plain-English summary
This CVE concerns COMMAX CVD-Axx DVR devices using weak default administrative credentials that can expose the web control panel and RTSP video stream remotely. For organizations using these DVRs, the main business risk is unauthorized surveillance access and possible device control. Public exploit material exists, but the provided sources do not show confirmed active exploitation.
Executive priority
Prioritize remediation for any internet-facing COMMAX DVRs or DVRs protecting sensitive areas. The risk is direct loss of camera confidentiality and possible administrative access. If the devices are isolated and credentials were changed, urgency is lower but validation is still needed.
Technical view
The issue is classified as CWE-1392: use of default credentials. The CVE record assigns CVSS 4.0 score 9.3, network exploitable, low complexity, no privileges, and high confidentiality, integrity, and availability impact. Source data is inconsistent on affected firmware, naming 5.1.4 in the description and CVD-AH04 DVR 4.4.1 in affected versions.
Likely exposure
Exposure is most likely where COMMAX CVD-Axx DVR web management or RTSP services are reachable from the internet or untrusted networks, especially if default credentials remain enabled. Internal-only deployments still carry risk from compromised users, flat networks, or exposed remote-access paths.
Exploitation context
ExploitDB and Zero Science Lab references indicate public exploit knowledge exists. However, the source bundle does not cite CISA KEV listing or another source confirming active exploitation in the wild. Treat internet-facing devices as urgent due to low attack complexity and direct video/control exposure.
Researcher notes
The record has notable version ambiguity between the description and affected-product fields. Do not assume all COMMAX products are affected based on these sources alone. Public exploit references exist, but the bundle does not establish active exploitation or a vendor patch. Focus validation on credential state, exposure, and exact device version.
Mitigation direction
- Identify all COMMAX CVD-Axx DVR deployments and firmware versions.
- Change default administrative credentials immediately where still present.
- Remove DVR web and RTSP services from direct internet exposure.
- Restrict access with VPN, firewall rules, or trusted management networks.
- Check COMMAX or reseller guidance for firmware updates or hardening steps.
- Monitor for unauthorized logins or unexpected RTSP access.
Validation and detection
- Inventory COMMAX DVR model and firmware from asset records or device management.
- Verify default credentials are disabled without publishing credential values.
- Check external exposure of DVR web management and RTSP services.
- Review firewall rules for unnecessary inbound access to DVRs.
- Inspect logs for failed logins, unknown sessions, or stream access.
- Compare findings against CVE, VulnCheck, and Zero Science Lab advisories.
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-1392: 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 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-2021-47707 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
- Critical
- CVSS
- 9.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-50210CVE reference · exploit
- Official Product HomepageCVE reference · product
- Zero Science Lab Disclosure (ZSL-2021-5667)CVE reference · third-party-advisory
- VulnCheck Advisory: COMMAX CVD-Axx DVR Weak Default Credentials Stream DisclosureCVE reference · third-party-advisory
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.
Use of Default Credentials
Use of Default Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.