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This indicates you are not vulnerable.
https://www.ptc.com/en/support/article/CS404211?source=search
This indicates that you can only upgrade Apache via CPS updates:
https://www.ptc.com/en/support/article/CS41511?source=search
More info:
https://www.ptc.com/en/support/article/CS390913?source=search
Appreciate this information. I was having trouble digging through more current version data to find what I needed.
Kind Regards.