diff --git a/src/ssl.c b/src/ssl.c
index fc09d9810..61d60b583 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -31987,9 +31987,68 @@ const char * wolfSSL_get_servername(WOLFSSL* ssl, byte type)
 
 WOLFSSL_CTX* wolfSSL_set_SSL_CTX(WOLFSSL* ssl, WOLFSSL_CTX* ctx)
 {
-    if (ssl && ctx && SetSSL_CTX(ssl, ctx, 0) == WOLFSSL_SUCCESS)
+    /* This method requires some explanation. Its sibling is
+     *   int SetSSL_CTX(WOLFSSL* ssl, WOLFSSL_CTX* ctx, int writeDup)
+     * which re-inits the WOLFSSL* with all settings in the new CTX.
+     * That one is the right one to use *before* a handshake is started.
+     *
+     * This method was added by OpenSSL to be used *during* the handshake, e.g.
+     * when a server inspects the SNI in a ClientHello callback and
+     * decides which set of certificates to use.
+     *
+     * Since, at the time the SNI callback is run, some decisions on
+     * Extensions or the ServerHello might already have been taken, this
+     * method is very restricted in what it does:
+     * - changing the server certificate(s)
+     * - changing the server id for session handling
+     * and everything else in WOLFSSL* needs to remain untouched.
+     */
+    WOLFSSL_ENTER("wolfSSL_set_SSL_CTX");
+    if (ssl == NULL || ctx == NULL)
+        return NULL;
+    if (ssl->ctx == ctx)
         return ssl->ctx;
-    return NULL;
+
+    if (SSL_CTX_RefCount(ctx, 1) < 0) {
+        /* can only fail on serious stuff, like mutex not working
+         * or ctx refcount out of whack. */
+        return NULL;
+    }
+    if (ssl->ctx) {
+        wolfSSL_CTX_free(ssl->ctx);
+    }
+    ssl->ctx = ctx;
+
+#ifndef NO_CERTS
+    /* ctx owns certificate, certChain and key */
+    ssl->buffers.certificate = ctx->certificate;
+    ssl->buffers.certChain = ctx->certChain;
+#ifdef WOLFSSL_TLS13
+    ssl->buffers.certChainCnt = ctx->certChainCnt;
+#endif
+    ssl->buffers.key      = ctx->privateKey;
+    ssl->buffers.keyType  = ctx->privateKeyType;
+    ssl->buffers.keyId    = ctx->privateKeyId;
+    ssl->buffers.keyLabel = ctx->privateKeyLabel;
+    ssl->buffers.keySz    = ctx->privateKeySz;
+    ssl->buffers.keyDevId = ctx->privateKeyDevId;
+    /* flags indicating what certs/keys are available */
+    ssl->options.haveRSA          = ctx->haveRSA;
+    ssl->options.haveDH           = ctx->haveDH;
+    ssl->options.haveECDSAsig     = ctx->haveECDSAsig;
+    ssl->options.haveECC          = ctx->haveECC;
+    ssl->options.haveStaticECC    = ctx->haveStaticECC;
+    ssl->options.haveFalconSig    = ctx->haveFalconSig;
+    ssl->options.haveDilithiumSig = ctx->haveDilithiumSig;
+#endif
+
+#ifdef OPENSSL_EXTRA
+    /* copy over application session context ID */
+    ssl->sessionCtxSz = ctx->sessionCtxSz;
+    XMEMCPY(ssl->sessionCtx, ctx->sessionCtx, ctx->sessionCtxSz);
+#endif
+
+    return ssl->ctx;
 }
 
 
diff --git a/tests/api.c b/tests/api.c
index 43ced5e44..6099083a8 100644
--- a/tests/api.c
+++ b/tests/api.c
@@ -57299,6 +57299,93 @@ static int test_wolfSSL_CTX_get_min_proto_version(void)
     return res;
 }
 
+#if defined(OPENSSL_ALL) || (defined(OPENSSL_EXTRA) && \
+    (defined(HAVE_STUNNEL) || defined(WOLFSSL_NGINX) || \
+    defined(HAVE_LIGHTY) || defined(WOLFSSL_HAPROXY) || \
+    defined(WOLFSSL_OPENSSH) || defined(HAVE_SBLIM_SFCB)))
+static int test_wolfSSL_set_SSL_CTX(void)
+{
+    int res = TEST_SKIPPED;
+#if (defined(OPENSSL_EXTRA) || defined(OPENSSL_ALL)) \
+    && !defined(WOLFSSL_NO_TLS12) && defined(WOLFSSL_TLS13)
+    WOLFSSL_CTX *ctx1, *ctx2;
+    WOLFSSL *ssl;
+    const byte *session_id1 = (const byte *)"CTX1";
+    const byte *session_id2 = (const byte *)"CTX2";
+
+    AssertNotNull(ctx1 = wolfSSL_CTX_new(wolfTLS_server_method()));
+    AssertTrue(wolfSSL_CTX_use_certificate_file(ctx1, svrCertFile,
+                                                WOLFSSL_FILETYPE_PEM));
+    AssertTrue(wolfSSL_CTX_use_PrivateKey_file(ctx1, svrKeyFile,
+                                               WOLFSSL_FILETYPE_PEM));
+    AssertIntEQ(wolfSSL_CTX_set_min_proto_version(ctx1, TLS1_2_VERSION),
+                WOLFSSL_SUCCESS);
+    AssertIntEQ(wolfSSL_CTX_get_min_proto_version(ctx1), TLS1_2_VERSION);
+    AssertIntEQ(wolfSSL_CTX_get_max_proto_version(ctx1), TLS1_3_VERSION);
+    AssertIntEQ(wolfSSL_CTX_set_session_id_context(ctx1, session_id1, 4),
+                WOLFSSL_SUCCESS);
+
+    AssertNotNull(ctx2 = wolfSSL_CTX_new(wolfTLS_server_method()));
+    AssertTrue(wolfSSL_CTX_use_certificate_file(ctx2, svrCertFile,
+                                                WOLFSSL_FILETYPE_PEM));
+    AssertTrue(wolfSSL_CTX_use_PrivateKey_file(ctx2, svrKeyFile,
+                                               WOLFSSL_FILETYPE_PEM));
+    AssertIntEQ(wolfSSL_CTX_set_min_proto_version(ctx2, TLS1_2_VERSION),
+                WOLFSSL_SUCCESS);
+    AssertIntEQ(wolfSSL_CTX_set_max_proto_version(ctx2, TLS1_2_VERSION),
+                WOLFSSL_SUCCESS);
+    AssertIntEQ(wolfSSL_CTX_get_min_proto_version(ctx2), TLS1_2_VERSION);
+    AssertIntEQ(wolfSSL_CTX_get_max_proto_version(ctx2), TLS1_2_VERSION);
+    AssertIntEQ(wolfSSL_CTX_set_session_id_context(ctx2, session_id2, 4),
+                WOLFSSL_SUCCESS);
+
+#ifdef HAVE_SESSION_TICKET
+    AssertIntEQ((wolfSSL_CTX_get_options(ctx1) & SSL_OP_NO_TICKET), 0);
+    wolfSSL_CTX_set_options(ctx2, SSL_OP_NO_TICKET);
+    AssertIntNE((wolfSSL_CTX_get_options(ctx2) & SSL_OP_NO_TICKET), 0);
+#endif
+
+    AssertNotNull(ssl = wolfSSL_new(ctx2));
+    AssertIntNE((wolfSSL_get_options(ssl) & WOLFSSL_OP_NO_TLSv1_3), 0);
+#ifdef WOLFSSL_INT_H
+    AssertIntEQ(XMEMCMP(ssl->sessionCtx, session_id2, 4), 0);
+    AssertTrue(ssl->buffers.certificate == ctx2->certificate);
+    AssertTrue(ssl->buffers.certChain == ctx2->certChain);
+#endif
+
+#ifdef HAVE_SESSION_TICKET
+    AssertIntNE((wolfSSL_get_options(ssl) & SSL_OP_NO_TICKET), 0);
+#endif
+
+    /* Set the ctx1 that has TLSv1.3 as max proto version */
+    AssertNotNull(wolfSSL_set_SSL_CTX(ssl, ctx1));
+
+    /* MUST not change proto versions of ssl */
+    AssertIntNE((wolfSSL_get_options(ssl) & WOLFSSL_OP_NO_TLSv1_3), 0);
+#ifdef HAVE_SESSION_TICKET
+    /* MUST not change */
+    AssertIntNE((wolfSSL_get_options(ssl) & SSL_OP_NO_TICKET), 0);
+#endif
+    /* MUST change */
+#ifdef WOLFSSL_INT_H
+    AssertTrue(ssl->buffers.certificate == ctx1->certificate);
+    AssertTrue(ssl->buffers.certChain == ctx1->certChain);
+    AssertIntEQ(XMEMCMP(ssl->sessionCtx, session_id1, 4), 0);
+#endif
+
+    wolfSSL_free(ssl);
+    wolfSSL_CTX_free(ctx1);
+    wolfSSL_CTX_free(ctx2);
+
+    res = TEST_RES_CHECK(1);
+#endif /* defined(OPENSSL_EXTRA) || defined(OPENSSL_ALL) */
+    return res;
+}
+#endif /* defined(OPENSSL_ALL) || (defined(OPENSSL_EXTRA) && \
+    (defined(HAVE_STUNNEL) || defined(WOLFSSL_NGINX) || \
+    defined(HAVE_LIGHTY) || defined(WOLFSSL_HAPROXY) || \
+    defined(WOLFSSL_OPENSSH) || defined(HAVE_SBLIM_SFCB))) */
+
 static int test_wolfSSL_security_level(void)
 {
     int res = TEST_SKIPPED;
@@ -60062,6 +60149,12 @@ TEST_CASE testCases[] = {
 #endif
 
     TEST_DECL(test_wolfSSL_CTX_get_min_proto_version),
+#if defined(OPENSSL_ALL) || (defined(OPENSSL_EXTRA) && \
+    (defined(HAVE_STUNNEL) || defined(WOLFSSL_NGINX) || \
+    defined(HAVE_LIGHTY) || defined(WOLFSSL_HAPROXY) || \
+    defined(WOLFSSL_OPENSSH) || defined(HAVE_SBLIM_SFCB)))
+    TEST_DECL(test_wolfSSL_set_SSL_CTX),
+#endif
 
     TEST_DECL(test_wolfSSL_security_level),
     TEST_DECL(test_wolfSSL_SSL_in_init),