Security readout for executives and security teams
Plain-English summary
CVE-2021-31505 affects Arlo Q Plus cameras running firmware 1.9.0.3_278. Someone with physical access can put the device into a special mode where hard-coded SSH credentials work, giving root-level control. Business urgency depends on whether these cameras are physically accessible to outsiders or untrusted personnel.
Executive priority
Treat this as a targeted physical-access risk, not an internet-scale emergency. Prioritize remediation where cameras protect sensitive areas, are reachable by the public, or are deployed in locations with weak physical control.
Technical view
The flaw is CWE-798: hard-coded credentials in the SSH service of Arlo Q Plus 1.9.0.3_278. The CVSS vector is physical access, low complexity, no privileges, no user interaction, with high confidentiality, integrity, and availability impact. Successful exploitation allows arbitrary code execution as root.
Likely exposure
Exposure is limited to Arlo Q Plus devices on firmware 1.9.0.3_278. Risk is highest for cameras in public, shared, leased, or weakly controlled spaces where an attacker can physically handle or reboot the device.
Exploitation context
The provided sources do not state active exploitation, and the CVE is not marked KEV. Exploitation requires physical access, but authentication is not required once the vulnerable operation mode is reached.
Researcher notes
ZDI reports the issue as ZDI-CAN-12890. Source data identifies SSH hard-coded credentials accepted in a special operation mode. Available evidence does not include exploit-in-the-wild claims or detailed fix information, so remediation should follow Arlo’s advisory.
Mitigation direction
- Identify any Arlo Q Plus devices running firmware 1.9.0.3_278.
- Check Arlo’s advisory for supported firmware or remediation guidance.
- Restrict physical access to affected cameras and nearby cabling.
- Replace or isolate affected devices if vendor remediation is unavailable.
- Prioritize devices in public or semi-trusted locations.
Validation and detection
- Inventory camera model names and firmware versions.
- Confirm whether any device is Arlo Q Plus 1.9.0.3_278.
- Review installation locations for realistic physical access risk.
- Check Arlo advisory records for available remediation status.
- Document compensating physical controls for each affected device.
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-798: 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 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-2021-31505 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
- Medium
- CVSS
- 6.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:P/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:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H0.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.8MediumVector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.zerodayinitiative.com/advisories/ZDI-21-683/CVE reference · x_refsource_MISC
- https://kb.arlo.com/000062592/Security-Advisory-for-Arlo-Q-Plus-SSH-Use-of-Hard-coded-Credentials-Allowing-Privilege-EscalationCVE 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.
Use of Hard-coded Credentials
Use of Hard-coded Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.