Security readout for executives and security teams
Plain-English summary
This vulnerability affects multiple Uniview IP camera models. A remote unauthenticated attacker can abuse an undocumented UDP service to execute code, start telnet, and access the device using documented hardcoded credentials. For businesses, exposed cameras could become entry points into physical-security networks or wider environments.
Executive priority
Prioritize externally reachable or security-critical camera deployments first. The business concern is not just camera compromise; compromised surveillance devices can provide persistence, credential exposure, or a network foothold in sensitive facilities.
Technical view
CVE-2021-45039 is a pre-authentication buffer overflow in an undocumented Uniview UDP service on port 7788. The CVE description says successful exploitation can lead to code execution and telnetd startup with hardcoded root/123456 credentials, followed by bypass of the restrictive shell via built-in behavior.
Likely exposure
Exposure is most likely where affected Uniview cameras are reachable from untrusted networks, especially if UDP port 7788 is accessible. The source lists example model families but does not provide complete CPEs or a full affected-version matrix.
Exploitation context
The CVE is not marked as CISA KEV in the supplied bundle. Public advisory material exists, but the provided sources do not establish active exploitation in the wild. Treat internet-exposed devices as high-risk because exploitation requires no authentication or user interaction.
Researcher notes
Evidence is strong for the vulnerability class and impact, but incomplete for exact affected versions and remediation details in the supplied bundle. Avoid assuming all Uniview cameras are affected. Validate model, firmware, network reachability, and vendor notice applicability.
Mitigation direction
- Inventory Uniview cameras and identify listed model families and firmware versions.
- Check Uniview’s security notice for vendor-confirmed updates or mitigation guidance.
- Block UDP port 7788 from untrusted networks and the internet.
- Place cameras on isolated, monitored network segments.
- Disable unnecessary remote access paths where operationally possible.
- Monitor for unexpected telnet service exposure on camera networks.
Validation and detection
- Scan asset inventory for Uniview IPC_G61, IPC21, IPC23, IPC32, IPC36, IPC62, and IPC_HCMN families.
- Confirm whether UDP port 7788 is reachable from non-camera networks.
- Review firewall logs for inbound traffic targeting UDP 7788.
- Check cameras for unexpected telnet service availability.
- Compare installed firmware against Uniview’s advisory guidance.
- Document compensating controls for devices awaiting vendor-confirmed remediation.
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
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CWE-120: Exact CWE lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program 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-2021-45039 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
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.