An OS command injection vulnerability exists in various models of E-Series Linksys routers via the /tmUnblock.cgi and /hndUnblock.cgi endpoints over HTTP on port 8080. The CGI scripts improperly process user-supplied input passed to the ttcp_ip parameter without sanitization, allowing unauthenticated attackers to inject shell commands. This vulnerability was reported to be exploited in the wild by the "TheMoon" worm in 2014 to deploy a MIPS ELF payload, enabling arbitrary code execution on the router. Additionally, this vulnerability may affect other Linksys products to include, but not limited to, WAG/WAP/WES/WET/WRT-series router models and Wireless-N access points and routers. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-06 UTC.
CVE-2025-34037
“—” beside the score: it is equal to NVD's CVSS score.
This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 96% (99th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2025-18964 (ENISA EUVD) · GHSA-4c6f-v7q4-2m38 (GitHub Security Advisories)Source: ENISA EUVD
- High exploitation likelihood — EPSS 96%
- Public exploit code is available (Metasploit)
No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.
The CVE record's CNA (VulnCheck) lists Linksys E4200 versions before 1.0.06; Linksys E3200 versions before 1.0.05; Linksys E3000 versions before 1.0.06 as affected, and 5 more products. No release containing a fix is confirmed on record.
- CVSS v3
- 10.0
- EG Score
- 10.0CRITICALmedium confidence
- EG Risk
- 98EG Risk 98/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity100% × 45%Impact severity (EG Severity): CVSS 10.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation96% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high. - EPSS PROB
- 96%
- EPSS %ILE
- 99th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (10.0): severity, escalated by confirmed exploitation. This CVE's 10.0 is its impact severity (EG Severity), not escalated.
- EG Severity
- 10.0 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 96% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.
No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.
No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
June 24, 2025
Last Modified
July 22, 2026
Advisory Details (4)
Auto-updated Oct 30, 2026CVE-research/Linksys/E-series/CVE-2025-34037 at main · Jarrettgohxz/CVE-research · GitHub
https://github.com/Jarrettgohxz/CVE-research/tree/main/Linksys/E-series/CVE-2025-34037Linksys E-series - Remote Code Execution - Hardware remote Exploit
https://www.exploit-db.com/exploits/31683Linksys Multiple Routers OS Command Injection | Advisories | VulnCheck
https://vulncheck.com/advisories/linksys-routers-command-injectionVendor Advisories for CVE-2025-34037(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 15× in last 7d / 55× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 90 of 122 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 10 repeat rows among the latest 100 are merged into the row they repeat. The 32 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-02 01:52 UTCEG score recompute
- 2026-11-02 01:52 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-11-01 02:51 UTCEG score recompute
- 2026-11-01 02:51 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-31 03:48 UTCEG score recompute
- 2026-10-31 03:48 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-30 04:46 UTCEG score recompute
- 2026-10-30 04:46 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-29 05:44 UTCEG score recompute
- 2026-10-29 05:44 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-28 06:42 UTCEG score recompute
- 2026-10-28 06:42 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-27 16:30 UTCEPSS rescoreEPSS 96% · 99th percentile
- 2026-10-27 07:40 UTCEG score recompute
- 2026-10-27 07:40 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-26 16:30 UTCEPSS rescoreEPSS 96% · 99th percentile
- 2026-10-26 05:56 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-25 16:33 UTCEG score recompute
- 2026-10-25 16:31 UTCEPSS rescoreEPSS 96% · 99th percentile
- 2026-10-25 06:53 UTCEG score recompute
- 2026-10-25 06:52 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-24 07:49 UTCEG score recompute
- 2026-10-24 07:49 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-23 08:45 UTCEG score recompute
- 2026-10-23 08:45 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
Show 65 moreShow fewer
- 2026-10-22 09:42 UTCEG score recompute
- 2026-10-22 09:41 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-21 16:31 UTCEPSS rescoreEPSS 93% · 99th percentile
- 2026-10-21 10:39 UTCEG score recompute
- 2026-10-21 10:38 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-20 11:34 UTCEG score recompute
- 2026-10-20 11:34 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-19 16:30 UTCEPSS rescoreEPSS 93% · 99th percentile
- 2026-10-19 12:26 UTCEG score recompute
- 2026-10-19 12:26 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-18 16:30 UTCEPSS rescoreEPSS 93% · 99th percentile
- 2026-10-18 10:43 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-18 05:37 UTCEG score recompute
- 2026-10-17 07:24 UTCEG score recompute
- 2026-10-17 07:24 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-16 08:19 UTCEG score recompute
- 2026-10-16 08:19 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-15 07:24 UTCEG score recompute
- 2026-10-15 07:24 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-14 16:31 UTCEPSS rescoreEPSS 93% · 99th percentile
- 2026-10-14 03:22 UTCEG score recompute
- 2026-10-14 03:22 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-13 16:32 UTCEPSS rescoreEPSS 93% · 99th percentile
- 2026-10-12 23:21 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-12 17:10 UTCEG score recompute
- 2026-10-12 11:31 UTCGHSA enrichmentGHSA-4c6f-v7q4-2m38 · GitHub severity CRITICAL
- 2026-10-11 20:42 UTCEG score recompute
- 2026-10-11 18:53 UTCEG score recompute
- 2026-10-11 15:30 UTCEG score recompute
- 2026-10-06 15:16 UTCEPSS rescoreEPSS 93% · 99th percentile
- 2026-09-26 00:24 UTCEPSS rescoreEPSS 93% · 99th percentile
- 2026-09-24 14:02 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-09-18 19:27 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-09-16 14:07 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-09-11 14:52 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-09-10 09:33 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-09-07 16:00 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-09-06 13:46 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-08-30 19:16 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-08-28 21:40 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-08-21 23:48 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-08-20 22:54 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-08-18 13:47 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-08-15 01:29 UTCEPSS rescoreEPSS 91% · 99th percentile
- 2026-08-12 13:50 UTCEPSS rescoreEPSS 86% · 99th percentile
- 2026-08-03 10:35 UTCEPSS rescoreEPSS 86% · 99th percentile
- 2026-07-30 01:29 UTCEPSS rescoreEPSS 86% · 99th percentile
- 2026-07-26 14:54 UTCEPSS rescoreEPSS 86% · 99th percentile
- 2026-07-24 14:17 UTCEPSS rescoreEPSS 86% · 99th percentile
- 2026-07-23 02:54 UTCEG score recompute▲ 1.00
- 2026-07-22 14:07 UTCEPSS rescoreEPSS 86% · 99th percentile
- 2026-07-20 17:07 UTCEPSS rescoreEPSS 86% · 99th percentile
- 2026-07-19 14:30 UTCEPSS rescoreEPSS 86% · 99th percentile
- 2026-07-15 16:57 UTCEPSS rescoreEPSS 86% · 99th percentile
- 2026-07-15 01:59 UTCEPSS rescoreEPSS 86% · 99th percentile
- 2026-07-13 06:12 UTCEPSS rescoreEPSS 85% · 99th percentile
- 2026-07-09 19:09 UTCEPSS rescoreEPSS 85% · 99th percentile
- 2026-07-04 06:30 UTCEPSS rescoreEPSS 85% · 99th percentile
- 2026-07-01 15:06 UTCEPSS rescoreEPSS 85% · 99th percentile
- 2026-06-27 03:08 UTCEPSS rescoreEPSS 85% · 99th percentile
- 2026-06-23 21:32 UTCEPSS rescoreEPSS 85% · 99th percentile
- 2026-06-19 19:25 UTCEPSS rescoreEPSS 85% · 99th percentile
- 2026-06-15 17:48 UTCEPSS rescoreEPSS 85% · 99th percentile
- 2026-06-14 23:17 UTCEPSS rescoreEPSS 89% · 99th percentile
Publicly available exploits
(1 reference)Public exploit code is referenced for this CVE (1 Metasploit module). No fix is confirmed yet, so defenders should restrict or isolate affected systems accordingly until one is published.
- Metasploitexploit/linux/http/linksys_themoon_exec✓ verifiedPublished Apr 4, 2014
Linksys E-Series TheMoon Remote Command Injection
Open source ↗
Related CVEs(same CWE)
Same CWE
10 shownCWE-20 · CWE-78
- CVE-2025-34036EG 9.8EPSS p98CRITICAL
- CVE-2025-34035EG 9.8EPSS p98CRITICAL
- CVE-2025-34033EG 8.8EPSS p96HIGH
- CVE-2025-34032EG 6.1MEDIUM
- CVE-2025-34031EG 7.5HIGH
- CVE-2025-34039EG 10.0CRITICAL
- CVE-2025-34041EG 10.0EPSS p94CRITICAL
- CVE-2025-4563EG 2.7LOW
- CVE-2025-34042EG 9.4CRITICAL
- CVE-2025-34043EG 10.0EPSS p94CRITICAL
Frequently asked(5)
What is CVE-2025-34037?
When was CVE-2025-34037 made public?
Is CVE-2025-34037 actively exploited?
What is the CVSS score of CVE-2025-34037?
How do I remediate CVE-2025-34037?
Dependency Blast Radius
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