In Network Security Services before 3.44, a malformed Netscape Certificate Sequence can cause NSS to crash, resulting in a denial of service.
https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04
https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.44_release_notes
https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf