Security readout for executives and security teams
Plain-English summary
Huawei HG630 V2 routers may expose the device serial number without login. The reported default administrator password can be derived from that serial number, allowing remote unauthenticated access where the management interface is reachable and defaults remain in use.
Executive priority
Treat this as a high-priority edge-device exposure issue. Affected routers can provide network control, and the reported path requires no prior access if management is reachable. Prioritize inventory, exposure reduction, and vendor-supported remediation.
Technical view
CVE-2020-37220 is an authentication bypass/default credential issue affecting Huawei HG630 V2. The unauthenticated device information API exposes SerialNumber, and the reported default password is derived from its last eight characters. CVSS 4.0 is 8.7, with network access, low complexity, and no privileges or user interaction required.
Likely exposure
Exposure is most likely for internet- or LAN-reachable Huawei HG630 V2 management interfaces, especially devices using factory administrator credentials. The bundle does not identify other Huawei models or firmware versions as affected.
Exploitation context
A public ExploitDB entry and third-party advisory are cited, but the CVE is not marked KEV. The provided sources do not establish active exploitation in the wild.
Researcher notes
Evidence supports CWE-798 and a default credential derivation path through unauthenticated serial number disclosure. The source bundle does not include a Huawei advisory, patch version, or confirmed exploitation telemetry, so avoid expanding scope beyond HG630 V2.
Mitigation direction
- Identify Huawei HG630 V2 routers in use or managed by providers.
- Check Huawei or ISP guidance for firmware updates or replacement advice.
- Disable internet-facing router administration wherever possible.
- Change factory administrator credentials on affected devices.
- Restrict management access to trusted internal networks or VPN only.
- Replace unsupported devices if no vendor-supported fix is available.
Validation and detection
- Confirm whether any deployed router is Huawei HG630 V2.
- Review whether management interfaces are reachable from the internet or untrusted LANs.
- Verify factory administrator credentials are not still in use.
- Check vendor, ISP, or asset records for firmware status and supportability.
- Monitor authentication and configuration-change logs where available.
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 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-2020-37220 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
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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.
SSVC decision data
CVSS vector scores
2 official scoresWe 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:N/VA:N/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
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
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-48310CVE reference, VulnCheck · exploit
- ReferenceCVE reference, VulnCheck · third-party-advisory
- VulnCheck Advisory: Huawei HG630 V2 Router Authentication Bypass via Serial NumberCVE reference, VulnCheck · 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 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.