Security readout for executives and security teams
Plain-English summary
CVE-2026-27848 is a critical command injection issue in specific Linksys MR9600 and MX4200 firmware. A network attacker could inject operating system commands during a TLS-SRP connection handshake, with commands running as root. This creates risk of full device compromise, data interception, configuration changes, and service disruption.
Executive priority
Treat this as urgent for any affected Linksys devices, especially if exposed beyond a trusted LAN. The business risk is full router compromise with potential network interception or disruption. If no fix is available, reduce exposure immediately and monitor vendor guidance.
Technical view
The issue is CWE-78: improper neutralization of special elements used in OS commands. The CVE states commands can be injected through the TLS-SRP handshake and executed as root. Affected versions named are MR9600 1.0.4.205530 and MX4200 1.0.13.210200. CVSS 3.1 is 9.8: network, low complexity, no privileges, no user interaction.
Likely exposure
Exposure is most likely where affected Linksys devices have the vulnerable TLS-SRP functionality reachable over a network. Internet-facing or broadly reachable management/service interfaces increase urgency. The sources do not state whether TLS-SRP is enabled by default or which ports are involved.
Exploitation context
No provided source states active exploitation, and the CVE is not marked KEV. However, the vulnerability is high-impact because it is unauthenticated, network-reachable, low complexity, and leads to root-level command execution on affected devices.
Researcher notes
The source bundle contains a minor data inconsistency: the description says MX4200 1.0.13.210200 is affected, while one affected entry shows defaultStatus as unaffected. Use the CVE description and advisory as primary until vendor clarification. No exploit code or patch details are provided in the sources.
Mitigation direction
- Check Linksys guidance and firmware advisories for confirmed fixes.
- Upgrade affected devices when a vendor-supported fixed firmware is available.
- Restrict network access to device management and TLS-SRP reachable services.
- Remove or isolate affected devices from untrusted networks until remediated.
- Prioritize internet-facing affected devices for immediate containment.
Validation and detection
- Inventory Linksys MR9600 and MX4200 devices and record firmware versions.
- Flag MR9600 1.0.4.205530 and MX4200 1.0.13.210200 for action.
- Confirm whether device services are reachable from untrusted networks.
- Review device and network logs for unusual TLS-SRP connection activity.
- Track vendor advisories for fixed firmware or configuration guidance.
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 lookupCVE-2026-27848 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
- CVE List V5 sourceCVE List V5
- https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-010.txtCVE reference · third-party-advisory, technical-description
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.