Security readout for executives and security teams
Plain-English summary
Comfast CF-N1-S version 2.6.0.1 contains a remotely reachable command-injection flaw. A user with low-level privileges could potentially make the device execute operating-system commands, compromising confidentiality, integrity, and availability. Public exploit material reportedly exists, increasing urgency, although active exploitation has not been confirmed.
Executive priority
Act immediately on confirmed version 2.6.0.1 deployments, especially internet-accessible or broadly reachable devices. Public exploit availability and potential full device compromise justify emergency exposure reduction while vendor remediation is investigated. Absence from KEV should not delay containment.
Technical view
The flaw affects the system function handling the timestr argument in /cgi-bin/mbox-config when setting ntp_timezone. Insufficient command neutralization permits command injection over the network with low privileges and no user interaction. CVSS 3.1 is 9.9, with scope change and high impact across confidentiality, integrity, and availability.
Likely exposure
Exposure is limited by the stated low-privilege requirement but remains serious for CF-N1-S devices running 2.6.0.1. Risk is greatest where the management interface is reachable from untrusted networks or weakly controlled internal segments. The bundle identifies no other affected models or versions.
Exploitation context
Public exploit material is referenced, so attempted exploitation is plausible. However, the CVE is not listed in KEV, and the supplied sources do not establish active exploitation in the wild. Treat public exploit availability as elevated risk, not proof of compromise.
Researcher notes
CWE-74 and CWE-77 describe improper neutralization leading to command injection. The supplied evidence identifies timestr within the ntp_timezone SET operation and requires low privileges. No vendor patch, fixed version, observed campaign, or confirmed indicator set is established in the bundle; avoid extending affected-version claims beyond 2.6.0.1.
Mitigation direction
- Identify and prioritize every Comfast CF-N1-S device running version 2.6.0.1.
- Restrict management-interface access to trusted administrators and dedicated management networks.
- Block management access from the internet and untrusted internal segments.
- Check current Comfast guidance for patched firmware or vendor-approved mitigation.
- Disable or isolate affected devices when adequate access controls cannot be enforced.
Validation and detection
- Verify device model and firmware version through trusted inventory or administrative records.
- Confirm the management interface is unreachable from internet and untrusted network segments.
- Review authentication, web, process, and outbound-network records for anomalous activity.
- Confirm only authorized administrators can access the affected configuration function.
- After remediation, recheck firmware versions, access controls, and device integrity.
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-74: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupCWE-77: 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-2026-77683 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
- 9.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
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
4 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:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R3.16VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R3.16VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P——VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR810VulDBVulnerability scoring details
Base CVSS 4.0 score
9.4CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
Base CVSS 3.1 score
9.9CriticalVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
Base CVSS 3.0 score
9.9CriticalVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
Base CVSS 2.0 score
9CriticalVector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timelineVulDB
Advisory disclosed
- Source timelineVulDB
VulDB entry created
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelineVulDB
VulDB entry last update
- 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
- VDB-394033 | Comfast CF-N1-S mbox-config system command injectionCVE reference, VulDB · vdb-entry, technical-description
- VDB-394033 | CTI Indicators (IOB, IOC, TTP, IOA)CVE reference, VulDB · signature, permissions-required
- CVE-2026-77683 | CVE Analysis and ReportCVE reference, VulDB · third-party-advisory
- Submit #881058 | Comfast CF-N1-S V2.6.0.1 Command InjectionCVE reference, VulDB · third-party-advisory
- https://github.com/AdminSafe/CVE/issues/8CVE reference, VulDB · exploit, issue-tracking
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 in Output Used by a Downstream Component
Improper Neutralization of Special Elements in Output Used by a Downstream Component represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Improper Neutralization of Special Elements used in a Command
Improper Neutralization of Special Elements used in a Command represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.