diff --git a/ssl/s3_clnt.c b/ssl/s3_clnt.c
index 36833f7304..d2afaa5b9f 100644
--- a/ssl/s3_clnt.c
+++ b/ssl/s3_clnt.c
@@ -1216,6 +1216,12 @@ int ssl3_get_server_certificate(SSL *s)
         goto f_err;
     }
     for (nc = 0; nc < llen;) {
+        if (nc + 3 > llen) {
+            al = SSL_AD_DECODE_ERROR;
+            SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
+                   SSL_R_CERT_LENGTH_MISMATCH);
+            goto f_err;
+        }
         n2l3(p, l);
         if ((l + nc + 3) > llen) {
             al = SSL_AD_DECODE_ERROR;
@@ -2171,6 +2177,11 @@ int ssl3_get_certificate_request(SSL *s)
     }
 
     for (nc = 0; nc < llen;) {
+        if (nc + 2 > llen) {
+            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
+            SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
+            goto err;
+        }
         n2s(p, l);
         if ((l + nc + 2) > llen) {
             if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c
index 7c19753853..01ccd5d2ae 100644
--- a/ssl/s3_srvr.c
+++ b/ssl/s3_srvr.c
@@ -3220,6 +3220,12 @@ int ssl3_get_client_certificate(SSL *s)
         goto f_err;
     }
     for (nc = 0; nc < llen;) {
+        if (nc + 3 > llen) {
+            al = SSL_AD_DECODE_ERROR;
+            SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,
+                   SSL_R_CERT_LENGTH_MISMATCH);
+            goto f_err;
+        }
         n2l3(p, l);
         if ((l + nc + 3) > llen) {
             al = SSL_AD_DECODE_ERROR;