.NET Framework Remote Code Execution Vulnerability

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
A high attack complexity means that successful exploitation is complex and time‑consuming, requiring significant effort and precise conditions for an attacker to reliably exploit the vulnerability.

Security updates
4.8.9344.0 — https://support.microsoft.com/help/5120711
10.0.11 — https://support.microsoft.com/help/5122106
8.0.30 — https://support.microsoft.com/help/5122104
9.0.19 — https://support.microsoft.com/help/5122105
4.8.4805.0 — https://support.microsoft.com/help/5120702
4.8.4805.0 — https://support.microsoft.com/help/5120704
4.8.4805.0 — https://support.microsoft.com/help/5120706
2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0 — https://support.microsoft.com/help/5120703
2.0.50727.9183 & 3.0.30729.9169 & 4.8.4805.0 — https://support.microsoft.com/help/5120705
2.0.50727.9183 & 3.0.30729.9169 & 4.8.4805.0 — https://support.microsoft.com/help/5120701
2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0 — https://support.microsoft.com/help/5120698
2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0 — https://support.microsoft.com/help/5120418
4.7.4144.0 — https://support.microsoft.com/help/5120699
4.7.4144.0 — https://support.microsoft.com/help/5120700
2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0 — https://support.microsoft.com/help/5120714
2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0 — https://support.microsoft.com/help/5120709
2.0.50727.9183 & 3.0.30729.9169 & 4.8.9344.0 — https://support.microsoft.com/help/5120708
2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0 — https://support.microsoft.com/help/5120713
2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0 — https://support.microsoft.com/help/5120710