How severe is CVE-2020-5646?

CVE-2020-5646 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-2020-5646 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5646?

CVE-2020-5646 affects Mitsubishielectric Coreos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5646?

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-2020-5646 published?

CVE-2020-5646 was published on 2020-11-06 and last updated on 2026-06-17.

CVE-2020-5646

CVE-2020-5646 is a high-severity vulnerability in Mitsubishielectric Coreos 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Mitsubishielectric Coreos
Published: 2020-11-06
Last modified: 2026-06-17

Description

NULL pointer dereferences vulnerability in TCP/IP function included in the firmware of GT14 Model of GOT 1000 series (GT1455-QTBDE CoreOS version "05.65.00.BD" and earlier, GT1450-QMBDE CoreOS version "05.65.00.BD" and earlier, GT1450-QLBDE CoreOS version "05.65.00.BD" and earlier, GT1455HS-QTBDE CoreOS version "05.65.00.BD" and earlier, and GT1450HS-QMBDE CoreOS version "05.65.00.BD" and earlier) allows a remote unauthenticated attacker to stop the network functions of the products via a specially crafted packet.

Frequently asked questions

What is CVE-2020-5646?: NULL pointer dereferences vulnerability in TCP/IP function included in the firmware of GT14 Model of GOT 1000 series (GT1455-QTBDE CoreOS version "05.65.00.BD" and earlier, GT1450-QMBDE CoreOS version "05.65.00.BD" and earlier, GT1450-QLBDE CoreOS version "05.65.00.BD" and earlier, GT1455HS-QTBDE CoreOS version "05.65.00.BD" and earlier, and GT1450HS-QMBDE CoreOS version "05.65.00.BD" and earlier) allows a remote unauthenticated attacker to stop the network functions of the products via a specially crafted packet.
How severe is CVE-2020-5646?: CVE-2020-5646 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-2020-5646 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5646?: CVE-2020-5646 affects Mitsubishielectric Coreos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5646?: 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-2020-5646 published?: CVE-2020-5646 was published on 2020-11-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:mitsubishielectric:coreos:*:*:*:*:*:*:*:*

More vulnerabilities in Mitsubishielectric Coreos

CVE-2020-5648 — Critical (CVSS 9.8): Improper neutralization of argument delimiters in a command ('Argument Injection') vulnerability in TCP/IP function…
CVE-2020-5647 — Critical (CVSS 9.8): Improper access control vulnerability in TCP/IP function included in the firmware of GT14 Model of GOT 1000 series…
CVE-2020-5644 — Critical (CVSS 9.8): Buffer overflow vulnerability in TCP/IP function included in the firmware of GT14 Model of GOT 1000 series…
CVE-2020-5599 — Critical (CVSS 9.8): TCP/IP function included in the firmware of Mitsubishi Electric GOT2000 series (CoreOS with version -Y and earlier…
CVE-2020-5595 — Critical (CVSS 9.8): TCP/IP function included in the firmware of Mitsubishi Electric GOT2000 series (CoreOS with version -Y and earlier…
CVE-2020-5649 — High (CVSS 7.5): Resource management error vulnerability in TCP/IP function included in the firmware of GT14 Model of GOT 1000 series…

All CVEs affecting Mitsubishielectric Coreos →

Other CWE-476 (NULL Pointer Dereference) vulnerabilities

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CVE-2020-14500 — Critical (CVSS 10.0): Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
CVE-2026-31436 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →