How severe is CVE-2020-5527?

CVE-2020-5527 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-5527 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5527?

CVE-2020-5527 primarily affects Mitsubishielectric Cr800-q Firmware. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-5527?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-5527 published?

CVE-2020-5527 was published on 2020-03-30 and last updated on 2026-06-17.

CVE-2020-5527

CVE-2020-5527 is a high-severity vulnerability in Mitsubishielectric Cr800-q Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Mitsubishielectric Cr800-q Firmware
Published: 2020-03-30
Last modified: 2026-06-17

Description

When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.

Frequently asked questions

What is CVE-2020-5527?: When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.
How severe is CVE-2020-5527?: CVE-2020-5527 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-5527 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5527?: CVE-2020-5527 primarily affects Mitsubishielectric Cr800-q Firmware. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-5527?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-5527 published?: CVE-2020-5527 was published on 2020-03-30 and last updated on 2026-06-17.

References

Affected products (46)

cpe:2.3:o:mitsubishielectric:cr800-q_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx3g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx3gc_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx3s_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx3u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx3uc_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uc_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uj_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:l02cpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:l02cpu-p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:l02scpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:l02scpu-p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:l06cpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:l06cpu-p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:l26cpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:l26cpu-bt_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:l26cpu-p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:l26cpu-pbt_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q02phcpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q06phcpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q12dccpu-v_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q12phcpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q12prhcpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q172dscpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q173dscpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q173nccpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q24dhccpu-ls_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q24dhccpu-v_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q24dhccpu-vg2_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q25phcpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q25prhcpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:q26dhccpu-ls_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:r00cpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:r01cpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:r02cpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:r04cpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:r04encpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:r08cpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:r08encpu_firmware:-:*:*:*:*:*:*:*

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