No exploitation reportedFix available

CVE-2019-10977

No exploitation reported by the sources we read.

Published2019-05-23
WeaknessCWE-400 · CWE-755

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Mitsubishi Electric MELSEC-Q series Ethernet module QJ71E71-100 serial number 20121 and prior, an attacker could send crafted TCP packets against the FTP service, forcing the target devices to enter an error mode and cause a denial-of-service condition.

Timeline

dates in UTC

2019-05-2314:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-10977?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-10977?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Mitsubishielectric qj71e71-100 firmwareversion to verify

Branch	Affected	Fixed in	Source
20121.x	≤ 20121	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-19-141-02 CISA1 known affected
Mitsubishi Electric MELSEC-Q Series Ethernet Module
QJ71E71-100: serial number 20121 and prior

Full record on NVD

Fix

Vendor fix CISA ICSA-19-141-02 · 1 productMitsubishi Electric has released new firmware Version 20122 for the QJ71E71-100 Ethernet module to mitigate the reported vulnerability.
Mitigation from the vendor CISA ICSA-19-141-02 · 1 productAdditional information about the vulnerabilities or Mitsubishi Electric's compensating control is available by contacting a local Mitsubishi Electric representative, which can be found at the following location:
Mitigation from the vendor CISA ICSA-19-141-02 · 1 productMitsubishi Electric strongly recommends that users should operate the affected device behind a firewall.

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.07.8read 2026-10-23
CNAweakness (CWE)CWE-400read 2026-10-23
NVDweakness (CWE)CWE-755read 2026-10-23
FIRST EPSSEPSS score3.5 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2019-05-23
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-10977?

Is CVE-2019-10977 actively exploited?

Active exploitation of CVE-2019-10977 has not been confirmed. Its EPSS score was 3.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-10977?

CVE-2019-10977 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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