How severe is CVE-2020-15415?

CVE-2020-15415 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-15415 being actively exploited?

Yes. CVE-2020-15415 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-09-30, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2020-15415?

CVE-2020-15415 primarily affects Draytek Vigor3900 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-15415?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2020-15415 have an EU (EUVD) identifier?

Yes. CVE-2020-15415 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-7408. It is also flagged as exploited in the EUVD (since 2024-09-30).

When was CVE-2020-15415 published?

CVE-2020-15415 was published on 2020-06-30 and last updated on 2026-06-17.

CVE-2020-15415

CVE-2020-15415 is a critical-severity vulnerability in Draytek Vigor3900 Firmware with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2024-09-30). The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 85% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2024-09-30)
EU (EUVD) id: EUVD-2020-7408
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2024-09-30)
Weakness: CWE-78
Affected product: Draytek Vigor3900 Firmware
Published: 2020-06-30
Last modified: 2026-06-17

Description

On DrayTek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1, cgi-bin/mainfunction.cgi/cvmcfgupload allows remote command execution via shell metacharacters in a filename when the text/x-python-script content type is used, a different issue than CVE-2020-14472.

Frequently asked questions

What is CVE-2020-15415?: On DrayTek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1, cgi-bin/mainfunction.cgi/cvmcfgupload allows remote command execution via shell metacharacters in a filename when the text/x-python-script content type is used, a different issue than CVE-2020-14472.
How severe is CVE-2020-15415?: CVE-2020-15415 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-15415 being actively exploited?: Yes. CVE-2020-15415 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-09-30, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2020-15415?: CVE-2020-15415 primarily affects Draytek Vigor3900 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-15415?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2020-15415 have an EU (EUVD) identifier?: Yes. CVE-2020-15415 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-7408. It is also flagged as exploited in the EUVD (since 2024-09-30).
When was CVE-2020-15415 published?: CVE-2020-15415 was published on 2020-06-30 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:draytek:vigor3900_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2960_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor300b_firmware:*:*:*:*:*:*:*:*

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CVE-2024-51252 — Critical (CVSS 9.8): In Draytek Vigor3900 1.5.1.3, attackers can inject malicious commands into mainfunction.cgi and execute arbitrary…
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