Description
Improper Handling of Length Parameter Inconsistency vulnerability in web server function on Mitsubishi Electric Corporation MELSEC iQ-F Series CPU module allows a remote unauthenticated attacker to delay the processing of the web server function and prevent legitimate users from utilizing the web server function, by sending a specially crafted HTTP request.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-32MT/ES | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-32MT/DS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-32MT/ESS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-32MT/DSS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-32MR/ES | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-32MR/DS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-64MT/ES | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-64MT/DS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-64MT/ESS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-64MT/DSS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-64MR/ES | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-64MR/DS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-80MT/ES | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-80MT/DS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-80MT/ESS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-80MT/DSS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-80MR/ES | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5U-80MR/DS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UC-32MT/D | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UC-32MT/DSS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UC-64MT/D | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UC-64MT/DSS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UC-96MT/D | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UC-96MT/DSS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UC-32MT/DS-TS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UC-32MT/DSS-TS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UC-32MR/DS-TS | 1.060 and later | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-24MT/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-24MT/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-24MT/ESS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-24MT/DSS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-24MR/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-24MR/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-40MT/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-40MT/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-40MT/ESS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-40MT/DSS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-40MR/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-40MR/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-60MT/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-60MT/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-60MT/ESS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-60MT/DSS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-60MR/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-60MR/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-24MT/ES-A | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-24MR/ES-A | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-40MT/ES-A | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-40MR/ES-A | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-60MT/ES-A | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5UJ-60MR/ES-A | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-30MT/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-30MT/ESS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-30MR/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-40MT/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-40MT/ESS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-40MR/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-60MT/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-60MT/ESS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-60MR/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-80MT/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-80MT/ESS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-80MR/ES | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-30MT/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-30MT/DSS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-30MR/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-40MT/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-40MT/DSS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-40MR/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-60MT/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-60MT/DSS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-60MR/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-80MT/DS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-80MT/DSS | All versions | — |
| Mitsubishi Electric | MELSEC iQ-F Series FX5S-80MR/DS | All versions | — |
Advisories 1
- ICSA-25-233-01 Mitsubishi Electric Corporation MELSEC iQ-F Series CPU module (Update A) CISA ICS & IT advisories · Sep 9, 2025
References
- https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-010_en.pdf vendor-advisory
- https://jvn.jp/vu/JVNVU90316328/ government-resource
- https://www.cisa.gov/news-events/ics-advisories/icsa-25-233-01 government-resource