empp = [SELECT id,Password__c FROM Employee__c WHERE id = :ApexPages.currentPage().getParameters().get('id')];        
        empp.password__c = srvrparmtr;

<aura:component Controller="PasswordReset" implements="flexipage:availableForRecordHome,force:hasRecordId,force:hasSObjectName" access="global" >
    <aura:attribute name="passstore" type="String"/>
    <lightning:input label="Enter New Password: " value="{!v.passstore}"/>
    <lightning:button label="Reset" onclick="{!c.change}"/>
</aura:component>

({
    change : function(component, event, helper) {
    
        var clntvar = component.get("v.passstore");
        console.log('I am in first var: '+ clntvar);
        var srvrvar = component.get("c.resetmthd");
        console.log('m in second var: '+srvrvar);
        srvrvar.setParams({srvrparmtr : clntvar ,recordId:component.get("v.recordId")});
        
        console.log('Hi, I am srvr parameter '+ srvrvar);
        srvrvar.setCallback(this,function(response){
            
            var state = response.getState()
            console.log('m in callback: '+state)
            if(state === "SUCCESS"){
                
                alert("Email sent to mentioned emailid: " + response.getReturnValue);
    }
                          else if (state === "INCOMPLETE") {
                alert("I am in incomplete");
                // do something
            }
            else if (state === "ERROR") {
                var errors = response.getError();
                if (errors) {
                    if (errors[0] && errors[0].message) {
                        console.log("Error message: " + 
                                 errors[0].message);
                    }
                } else {
                    console.log("Unknown error");
                }
                     }
            
        });
        $A.enqueueAction(srvrvar);
    }   
})

public class PasswordReset {
    
    @AuraEnabled
    public static void resetmthd(String srvrparmtr , String recordId){        
        List<Employee__c> emplst = new List<Employee__c>();
        Employee__c empp = new Employee__c();
       // System.debug('hi m server method parameter: '+ ApexPages.currentPage().getParameters().get('id'));
        empp = [SELECT id,Password__c FROM Employee__c WHERE id = :recordId];        
        empp.password__c = srvrparmtr;
        emplst.add(empp);        
        try{
        update emplst;
         }
        Catch(Exception e){
           System.debug('M in server controller '+ emplst);
           System.debug('hi m server method parameter: '+ ApexPages.currentPage().getParameters().get('id'));   
        }   
    }
}