How severe is CVE-2021-46621?

CVE-2021-46621 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-46621 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-46621?

CVE-2021-46621 primarily affects Bentley Microstation. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-46621?

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-2021-46621 published?

CVE-2021-46621 was published on 2022-02-18 and last updated on 2026-06-17.

CVE-2021-46621

CVE-2021-46621 is a high-severity vulnerability in Bentley Microstation with a CVSS 3.x base score of 7.8. 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-415.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-415
Affected product: Bentley Microstation
Published: 2022-02-18
Last modified: 2026-06-17

Description

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Bentley MicroStation CONNECT 10.16.0.80. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of JT files. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-15415.

Frequently asked questions

What is CVE-2021-46621?: This vulnerability allows remote attackers to execute arbitrary code on affected installations of Bentley MicroStation CONNECT 10.16.0.80. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of JT files. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-15415.
How severe is CVE-2021-46621?: CVE-2021-46621 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-46621 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-46621?: CVE-2021-46621 primarily affects Bentley Microstation. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-46621?: 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-2021-46621 published?: CVE-2021-46621 was published on 2022-02-18 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:bentley:microstation:*:*:*:*:*:*:*:*
cpe:2.3:a:bentley:microstation_connect:*:*:*:*:*:*:*:*
cpe:2.3:a:bentley:view:*:*:*:*:*:*:*:*

More vulnerabilities in Bentley Microstation

CVE-2023-44430 — High (CVSS 7.8): Bentley View SKP File Parsing Use-After-Free Remote Code Execution Vulnerability. This vulnerability allows remote…
CVE-2022-28647 — High (CVSS 7.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Bentley MicroStation…
CVE-2022-28646 — High (CVSS 7.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Bentley MicroStation…
CVE-2022-28644 — High (CVSS 7.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Bentley MicroStation…
CVE-2022-28643 — High (CVSS 7.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Bentley MicroStation…
CVE-2022-28642 — High (CVSS 7.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Bentley MicroStation…

All CVEs affecting Bentley Microstation →

Other CWE-415 (Double Free) vulnerabilities

CVE-2018-0101 — Critical (CVSS 10.0): A vulnerability in the Secure Sockets Layer (SSL) VPN functionality of the Cisco Adaptive Security Appliance (ASA)…
CVE-2026-8925 — Critical (CVSS 9.8): The curl logic that works with SASL authentication could end up cleaning up the GSASL context *twice* without clearing…
CVE-2020-37239 — Critical (CVSS 9.8): libbabl 0.1.62 contains a broken double free detection vulnerability that allows attackers to bypass memory safety…
CVE-2026-43011 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix potential double free of skb When…
CVE-2026-31609 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid double-free in…
CVE-2026-31608 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: server: avoid double-free in…

Browse all CWE-415 (Double Free) vulnerabilities →