Security readout for executives and security teams
Plain-English summary
CVE-2020-10886 is an unauthenticated remote code execution flaw in TP-Link Archer A7 AC1750 firmware Ver: 190726. A reachable attacker could execute code through the router's tmpServer service. Treat affected devices as high-priority because routers sit at network boundaries and compromise can affect traffic visibility, availability, and trust.
Executive priority
Prioritize identification and containment of affected routers. Business urgency is high where these devices are exposed beyond trusted administrative networks, but the available evidence does not prove active exploitation or name a vendor fix.
Technical view
The flaw is CWE-78 command injection in tmpServer, which listens on TCP port 20002. The issue is improper validation of a user-supplied string before a system call. CVSS 3.0 is 8.1 with network attack vector, no privileges, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to TP-Link Archer A7 AC1750 routers running firmware Ver: 190726, especially where TCP port 20002 is reachable from untrusted networks. The source bundle does not identify other TP-Link models or firmware versions as affected.
Exploitation context
The sources state authentication is not required, but attack complexity is high. The bundle does not cite CISA KEV listing, public exploitation in the wild, exploit availability, or a named fixed firmware version.
Researcher notes
Focus validation on product, firmware, and reachability of tmpServer on TCP 20002. Do not broaden scope beyond Archer A7 firmware Ver: 190726 without additional evidence. Remediation evidence is incomplete in the provided sources.
Mitigation direction
- Inventory TP-Link Archer A7 devices and verify firmware version.
- Check TP-Link guidance for fixed firmware or replacement advice.
- Block untrusted access to TCP port 20002.
- Remove affected routers from internet-facing or guest-accessible segments.
- Monitor affected devices for unexpected configuration or availability changes.
Validation and detection
- Confirm whether any Archer A7 runs firmware Ver: 190726.
- Verify TCP port 20002 is not reachable from untrusted networks.
- Review firewall rules controlling access to the router service.
- Document any vendor advisory or firmware remediation found.
- Retest exposure after firmware or network changes.
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-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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-2020-10886 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
- 8.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/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:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.1HighVector: CVSS:3.0/AV:N/AC:H/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-20-339/CVE 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.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.