Security readout for executives and security teams
Plain-English summary
CVE-2023-25117 affects Milesight UR32L routers running v32.3.0.5. A privileged attacker can send a crafted HTTP request that triggers a buffer overflow and may execute arbitrary code. Business risk is highest where these devices are used for remote connectivity, VPN, or site networking and their management interface is reachable.
Executive priority
Treat this as a high-priority network-edge device issue, especially for remote sites or VPN-dependent operations. The privilege requirement lowers opportunistic risk, but compromise could affect routing, confidentiality, and availability. Prioritize exposure reduction while checking vendor remediation guidance.
Technical view
Talos reports unsafe sprintf use in the vtysh_ubus binary. The overflow is in set_openvpn_client, involving local_virtual_ip and local_virtual_mask handling. The CVSS 3.1 score is 7.2, reflecting network access, low attack complexity, high privileges, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Known affected exposure is limited to Milesight UR32L firmware v32.3.0.5 in the provided sources. Environments should prioritize internet-reachable or broadly reachable HTTP management interfaces, shared administrative accounts, and devices used for VPN or operational network routing.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires high privileges and a crafted HTTP request. The impact is still serious because successful exploitation can lead to arbitrary code execution on a network edge device.
Researcher notes
Evidence is specific to vtysh_ubus on Milesight UR32L v32.3.0.5. The described vulnerable fields are local_virtual_ip and local_virtual_mask in set_openvpn_client. The bundle does not identify patched versions, exploit-in-the-wild evidence, or broader affected firmware families.
Mitigation direction
- Inventory Milesight UR32L devices and identify firmware v32.3.0.5.
- Check Milesight guidance for fixed firmware or vendor-recommended mitigations.
- Restrict HTTP management access to trusted administration networks only.
- Review and reduce high-privilege accounts with access to affected devices.
- Monitor device logs for unusual administrative changes or OpenVPN configuration activity.
Validation and detection
- Confirm device model and firmware version from authorized management channels.
- Verify whether management interfaces are reachable from untrusted networks.
- Review administrative account membership and recent privileged login history.
- Check OpenVPN client configuration changes for unexpected values or timing.
- Track remediation status against vendor guidance and internal asset inventory.
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-121: 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 lookupCVE-2023-25117 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
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/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:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:H/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.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.