Comment 9 for bug 1928989

Reproduced the bug with:

# dpkg-query -W libssl1.0.0 openssl
libssl1.0.0:amd64 1.0.2g-1ubuntu4.19
openssl 1.0.2g-1ubuntu4.19

# openssl s_client -connect expired-root-ca-test.germancoding.com:443 -servername expired-root-ca-test.germancoding.com -verify 1 -verifyCAfile ca.pem
verify depth is 1
CONNECTED(00000003)
depth=3 C = US, O = (STAGING) Internet Security Research Group, CN = (STAGING) Doctored Durian Root CA X3
verify error:num=10:certificate has expired
notAfter=Jan 30 14:01:15 2021 GMT
140540576667288:error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed:s3_clnt.c:1264:

# upgrading

# dpkg-query -W libssl1.0.0 openssl
libssl1.0.0:amd64 1.0.2g-1ubuntu4.20
openssl 1.0.2g-1ubuntu4.20

# # openssl s_client -connect expired-root-ca-test.germancoding.com:443 -servername expired-root-ca-test.germancoding.com -verify 1 -verifyCAfile ca.pem
verify depth is 1
CONNECTED(00000003)
depth=2 C = US, O = (STAGING) Internet Security Research Group, CN = (STAGING) Pretend Pear X1
verify return:1
depth=1 C = US, O = (STAGING) Let's Encrypt, CN = (STAGING) Artificial Apricot R3
verify return:1
depth=0 CN = expired-root-ca-test.germancoding.com
verify return:1
---
Certificate chain
 0 s:/CN=expired-root-ca-test.germancoding.com
   i:/C=US/O=(STAGING) Let's Encrypt/CN=(STAGING) Artificial Apricot R3
 1 s:/C=US/O=(STAGING) Let's Encrypt/CN=(STAGING) Artificial Apricot R3
   i:/C=US/O=(STAGING) Internet Security Research Group/CN=(STAGING) Pretend Pear X1
 2 s:/C=US/O=(STAGING) Internet Security Research Group/CN=(STAGING) Pretend Pear X1
   i:/C=US/O=(STAGING) Internet Security Research Group/CN=(STAGING) Doctored Durian Root CA X3
---
Server certificate
-----BEGIN CERTIFICATE-----
MIIGgTCCBWmgAwIBAgITAPqeXD5BcpT3tXI8aoDSYano7DANBgkqhkiG9w0BAQsF

....

connection is successful.