CVE-2023-33778

CVE-2023-33778 is a critical-severity vulnerability in Draytek Myvigor with a CVSS 3.x base score of 9.8. 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-798.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• EPSS exploit prediction: 1% (44th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-798
• Affected product: Draytek Myvigor
• Published: 2023-06-01
• Last modified: 2026-06-17

Description

Draytek Vigor Routers firmware versions below 3.9.6/4.2.4, Access Points firmware versions below v1.4.0, Switches firmware versions below 2.6.7, and Myvigor firmware versions below 2.3.2 were discovered to use hardcoded encryption keys which allows attackers to bind any affected device to their own account. Attackers are then able to create WCF and DrayDDNS licenses and synchronize them from the website.

Frequently asked questions

What is CVE-2023-33778?

Draytek Vigor Routers firmware versions below 3.9.6/4.2.4, Access Points firmware versions below v1.4.0, Switches firmware versions below 2.6.7, and Myvigor firmware versions below 2.3.2 were discovered to use hardcoded encryption keys which allows attackers to bind any affected device to their own account. Attackers are then able to create WCF and DrayDDNS licenses and synchronize them from the website.

How severe is CVE-2023-33778?

CVE-2023-33778 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-2023-33778 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-33778?

CVE-2023-33778 primarily affects Draytek Myvigor. In total, 72 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-33778?

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

When was CVE-2023-33778 published?

CVE-2023-33778 was published on 2023-06-01 and last updated on 2026-06-17.

References

• https://gist.github.com/Ji4n1ng/6d028709d39458f5ab95b3ea211225ef

Affected products (72)

• cpe:2.3:a:draytek:myvigor:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_pq2200xb_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_pq2121x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_p2540xs_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_p2280x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_p2100_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_q2200x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_q2121x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_g2540xs_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_g2280x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_g2121_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_g2100_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_fx2120_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_p1282_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_g1282_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_g1085_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorswitch_g1080_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorap_903_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorap_912c_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorap_918r_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorap_1060c_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorap_906_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorap_960c_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorap_1000c_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2766ac_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2766ax_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2766vac_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2765ax_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2765vac_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2765ac_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2763ac_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2620l_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2620ln_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigorlte_200n_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2915ac_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2135ac_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2135ax_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2135fvac_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2135vac_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:draytek:vigor2866ax_firmware:*:*:*:*:*:*:*:*

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