Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated attacker run operating-system commands on affected Linksys routers through exposed HTTP CGI endpoints. For a business, the main concern is takeover of edge network devices, which can enable malware, traffic interception, outages, or pivoting into internal networks.
Executive priority
Prioritize this as urgent for any organization using legacy Linksys edge devices. The vulnerability is unauthenticated, network-reachable, rated CVSS 10, and has historical worm exploitation plus later observed exploitation evidence.
Technical view
CVE-2025-34037 is CWE-78 command injection in /tmUnblock.cgi and /hndUnblock.cgi on HTTP port 8080. Unsanitized ttcp_ip input can allow unauthenticated remote code execution. Sources cite Linksys E-series models and possible WAG/WAP/WES/WET/WRT and Wireless-N products, but affected-product evidence is broad and partly incomplete.
Likely exposure
Highest risk is legacy Linksys routers or access points with HTTP management on port 8080 reachable from the internet or untrusted networks. The source bundle names several E-series models and says other Linksys product families may also be affected, but exact firmware scope is not fully established.
Exploitation context
The source bundle reports in-the-wild exploitation by TheMoon worm in 2014 and exploitation evidence observed by Shadowserver on 2025-02-06 UTC. It is not marked as CISA KEV in the provided data, so treat current exploitation status as evidenced but not KEV-confirmed.
Researcher notes
The public record supports command injection through ttcp_ip on two CGI endpoints, but product and firmware boundaries remain imprecise. Avoid assuming every Linksys router is affected; validate model, firmware, management exposure, and logs before scoping remediation.
Mitigation direction
- Inventory Linksys E-series, WAG, WAP, WES, WET, WRT, and Wireless-N devices.
- Block internet access to router management interfaces, especially HTTP port 8080.
- Disable remote administration where it is not strictly required.
- Check Linksys or vendor guidance for firmware updates or replacement recommendations.
- Replace unsupported devices that cannot receive security fixes.
- Monitor perimeter telemetry for requests to the named CGI endpoints.
Validation and detection
- Search asset inventories for the listed Linksys model families.
- Confirm whether HTTP port 8080 is reachable from untrusted networks.
- Review logs for requests to /tmUnblock.cgi or /hndUnblock.cgi.
- Inspect security telemetry for suspicious ttcp_ip parameter activity.
- Verify firmware status against vendor guidance, where available.
- Check for unexpected MIPS ELF binaries or persistence on exposed devices.
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-2025-34037 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
- 10 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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.
SSVC decision data
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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
10CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
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
- https://isc.sans.edu/diary/17633CVE reference, VulnCheck · technical-description
- https://www.exploit-db.com/exploits/31683CVE reference, VulnCheck · third-party-advisory, exploit
- https://vulncheck.com/advisories/linksys-routers-command-injectionCVE reference, VulnCheck · third-party-advisory
- https://github.com/Jarrettgohxz/CVE-research/tree/main/Linksys/E-series/CVE-2025-34037CVE reference, CVE
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.