diff --git a/config/config.go b/config/config.go
index f0e9f5c7fa7..ac6fc74e1a5 100644
--- a/config/config.go
+++ b/config/config.go
@@ -1107,6 +1107,8 @@ func SetupViper(v *viper.Viper, filename string, bidderInfos BidderInfos) {
 	v.SetDefault("account_defaults.price_floors.fetch.max_age_sec", 86400)
 	v.SetDefault("account_defaults.price_floors.fetch.period_sec", 3600)
 	v.SetDefault("account_defaults.price_floors.fetch.max_schema_dims", 0)
+	v.SetDefault("account_defaults.privacy.privacysandbox.cookiedeprecation.enabled", false)
+	v.SetDefault("account_defaults.privacy.privacysandbox.cookiedeprecation.ttl_sec", 604800)
 
 	v.SetDefault("account_defaults.events_enabled", false)
 	v.SetDefault("account_defaults.privacy.ipv6.anon_keep_bits", 56)
diff --git a/config/config_test.go b/config/config_test.go
index a551c1be66e..8fe132f51f8 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -203,6 +203,8 @@ func TestDefaults(t *testing.T) {
 	cmpInts(t, "account_defaults.price_floors.fetch.period_sec", 3600, cfg.AccountDefaults.PriceFloors.Fetcher.Period)
 	cmpInts(t, "account_defaults.price_floors.fetch.max_age_sec", 86400, cfg.AccountDefaults.PriceFloors.Fetcher.MaxAge)
 	cmpInts(t, "account_defaults.price_floors.fetch.max_schema_dims", 0, cfg.AccountDefaults.PriceFloors.Fetcher.MaxSchemaDims)
+	cmpBools(t, "account_defaults.privacy.privacysandbox.cookiedeprecation.enabled", false, cfg.AccountDefaults.Privacy.PrivacySandbox.CookieDeprecation.Enabled)
+	cmpInts(t, "account_defaults.privacy.privacysandbox.cookiedeprecation.ttl_sec", 604800, cfg.AccountDefaults.Privacy.PrivacySandbox.CookieDeprecation.TTLSec)
 
 	cmpBools(t, "account_defaults.events.enabled", false, cfg.AccountDefaults.Events.Enabled)
 
diff --git a/endpoints/cookie_sync.go b/endpoints/cookie_sync.go
index 6e82ce8bcbc..d6e0b31a096 100644
--- a/endpoints/cookie_sync.go
+++ b/endpoints/cookie_sync.go
@@ -484,11 +484,11 @@ func (c *cookieSyncEndpoint) setCookieDeprecationHeader(w http.ResponseWriter, r
 		SameSite: http.SameSiteNoneMode,
 		Expires:  c.time.Now().Add(time.Second * time.Duration(account.Privacy.PrivacySandbox.CookieDeprecation.TTLSec)),
 	}
-	setCookie(w, cookie)
+	setCookiePartitioned(w, cookie)
 }
 
-// setCookie temporary substitute for http.SetCookie(w, cookie) until it supports Partitioned cookie type. Refer https://github.com/golang/go/issues/62490
-func setCookie(w http.ResponseWriter, cookie *http.Cookie) {
+// setCookiePartitioned temporary substitute for http.SetCookie(w, cookie) until it supports Partitioned cookie type. Refer https://github.com/golang/go/issues/62490
+func setCookiePartitioned(w http.ResponseWriter, cookie *http.Cookie) {
 	if v := cookie.String(); v != "" {
 		w.Header().Add("Set-Cookie", v+"; Partitioned;")
 	}
diff --git a/endpoints/cookie_sync_test.go b/endpoints/cookie_sync_test.go
index 89b6dafc38e..35d7dd4baf5 100644
--- a/endpoints/cookie_sync_test.go
+++ b/endpoints/cookie_sync_test.go
@@ -2289,6 +2289,7 @@ func TestSetCookieDeprecationHeader(t *testing.T) {
 			name:                            "not-present-account-nil",
 			request:                         getTestRequest(false),
 			responseWriter:                  httptest.NewRecorder(),
+			account:                         nil,
 			expectedCookieDeprecationHeader: false,
 		},
 		{
@@ -2342,6 +2343,7 @@ func TestSetCookieDeprecationHeader(t *testing.T) {
 			name:                            "present-account-nil",
 			request:                         getTestRequest(true),
 			responseWriter:                  httptest.NewRecorder(),
+			account:                         nil,
 			expectedCookieDeprecationHeader: false,
 		},
 		{
diff --git a/endpoints/openrtb2/auction.go b/endpoints/openrtb2/auction.go
index 18a4553a095..27423c6322a 100644
--- a/endpoints/openrtb2/auction.go
+++ b/endpoints/openrtb2/auction.go
@@ -1932,6 +1932,15 @@ func validateOrFillCDep(httpReq *http.Request, req *openrtb_ext.RequestWrapper,
 		return nil
 	}
 
+	deviceExt, err := req.GetDeviceExt()
+	if err != nil {
+		return err
+	}
+
+	if deviceExt.GetCDep() != "" {
+		return nil
+	}
+
 	secCookieDeprecation := httpReq.Header.Get(secCookieDeprecation)
 	if secCookieDeprecation == "" {
 		return nil
@@ -1943,11 +1952,6 @@ func validateOrFillCDep(httpReq *http.Request, req *openrtb_ext.RequestWrapper,
 		}
 	}
 
-	deviceExt, err := req.GetDeviceExt()
-	if err != nil {
-		return err
-	}
-
 	deviceExt.SetCDep(secCookieDeprecation)
 	return nil
 }
diff --git a/endpoints/openrtb2/auction_test.go b/endpoints/openrtb2/auction_test.go
index 6a7cd95bb01..135409bc5d1 100644
--- a/endpoints/openrtb2/auction_test.go
+++ b/endpoints/openrtb2/auction_test.go
@@ -6169,6 +6169,9 @@ func TestValidateOrFillCDep(t *testing.T) {
 			name: "cookie-deprecation-enabled-header-not-present-in-request",
 			args: args{
 				httpReq: &http.Request{},
+				req: &openrtb_ext.RequestWrapper{
+					BidRequest: &openrtb2.BidRequest{},
+				},
 				account: config.Account{
 					Privacy: config.AccountPrivacy{
 						PrivacySandbox: config.PrivacySandbox{
@@ -6285,6 +6288,32 @@ func TestValidateOrFillCDep(t *testing.T) {
 				WarningCode: errortypes.SecCookieDeprecationLenWarningCode,
 			},
 		},
+		{
+			name: "header-present-request-device-ext-cdep-present",
+			args: args{
+				httpReq: &http.Request{
+					Header: http.Header{secCookieDeprecation: []string{"example_label_1"}},
+				},
+				req: &openrtb_ext.RequestWrapper{
+					BidRequest: &openrtb2.BidRequest{
+						Device: &openrtb2.Device{
+							Ext: json.RawMessage(`{"foo":"bar","cdep":"example_label_2"}`),
+						},
+					},
+				},
+				account: config.Account{
+					Privacy: config.AccountPrivacy{
+						PrivacySandbox: config.PrivacySandbox{
+							CookieDeprecation: config.CookieDeprecation{
+								Enabled: true,
+							},
+						},
+					},
+				},
+			},
+			wantDeviceExt: json.RawMessage(`{"foo":"bar","cdep":"example_label_2"}`),
+			wantErr:       nil,
+		},
 		{
 			name: "header-present-request-device-ext-invalid",
 			args: args{