diff --git a/.golangci.yml b/.golangci.yml
index 652f142..450fafe 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -13,6 +13,7 @@ linters:
     - godot
     - goerr113
     - gofumpt
+    - exhaustivestruct
 
 issues:
   exclude-rules:
diff --git a/cli/cmd/dir.go b/cli/cmd/dir.go
index 9086ffa..df6a4e3 100644
--- a/cli/cmd/dir.go
+++ b/cli/cmd/dir.go
@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"errors"
 	"fmt"
 	"log"
 
@@ -25,8 +26,9 @@ func runDir(cmd *cobra.Command, args []string) error {
 	}
 
 	if err := cli.Gobuster(mainContext, globalopts, plugin); err != nil {
-		if goberr, ok := err.(*gobusterdir.ErrWildcard); ok {
-			return fmt.Errorf("%s. To continue please exclude the status code, the length or use the --wildcard switch", goberr.Error())
+		var wErr *gobusterdir.ErrWildcard
+		if errors.As(err, &wErr) {
+			return fmt.Errorf("%w. To continue please exclude the status code, the length or use the --wildcard switch", wErr)
 		}
 		return fmt.Errorf("error on running gobuster: %w", err)
 	}
diff --git a/cli/cmd/http.go b/cli/cmd/http.go
index 3ddce54..ba7eaea 100644
--- a/cli/cmd/http.go
+++ b/cli/cmd/http.go
@@ -52,7 +52,11 @@ func parseBasicHTTPOptions(cmd *cobra.Command) (libgobuster.BasicHTTPOptions, er
 		return options, fmt.Errorf("invalid value for random-agent: %w", err)
 	}
 	if randomUA {
-		options.UserAgent = helper.GetRandomUserAgent()
+		ua, err := helper.GetRandomUserAgent()
+		if err != nil {
+			return options, err
+		}
+		options.UserAgent = ua
 	}
 
 	options.Proxy, err = cmd.Flags().GetString("proxy")
diff --git a/cli/cmd/root.go b/cli/cmd/root.go
index c613c93..1959128 100644
--- a/cli/cmd/root.go
+++ b/cli/cmd/root.go
@@ -47,7 +47,7 @@ func Execute() {
 		// Once before and once after the help output. Not sure if
 		// this is going to be needed to output other errors that
 		// aren't automatically outputted.
-		//fmt.Println(err)
+		// fmt.Println(err)
 		os.Exit(1)
 	}
 }
diff --git a/go.mod b/go.mod
index 8c36ba2..b8c68a4 100644
--- a/go.mod
+++ b/go.mod
@@ -1,10 +1,11 @@
 module github.com/OJ/gobuster/v3
 
 require (
-	github.com/google/uuid v1.1.2
+	github.com/google/uuid v1.1.4
 	github.com/spf13/cobra v1.1.1
-	golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897
-	golang.org/x/sys v0.0.0-20201018230417-eeed37f84f13 // indirect
+	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
+	golang.org/x/sys v0.0.0-20210104204734-6f8348627aad // indirect
+	golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf // indirect
 )
 
 go 1.15
diff --git a/go.sum b/go.sum
index 436c285..abfda8c 100644
--- a/go.sum
+++ b/go.sum
@@ -62,8 +62,8 @@ github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXi
 github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
 github.com/google/pprof v0.0.0-20190515194954-54271f7e092f/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
-github.com/google/uuid v1.1.2 h1:EVhdT+1Kseyi1/pUmXKaFxYsDNy9RQYkMWRH68J/W7Y=
-github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.1.4 h1:0ecGp3skIrHWPNGPJDaBIghfA6Sp7Ruo2Io8eLKzWm0=
+github.com/google/uuid v1.1.4/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
@@ -178,8 +178,8 @@ golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897 h1:pLI5jrR7OSLijeIDcmRxNmw2api+jEfxLoykJVice/E=
-golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad h1:DN0cp81fZ3njFcrLCytUHRSUkqBjfTo4Tx9RJTWs0EY=
+golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@@ -234,8 +234,14 @@ golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201018230417-eeed37f84f13 h1:5jaG59Zhd+8ZXe8C+lgiAGqkOaZBruqrWclLkgAww34=
-golang.org/x/sys v0.0.0-20201018230417-eeed37f84f13/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210104204734-6f8348627aad h1:MCsdmFSdEd4UEa5TKS5JztCRHK/WtvNei1edOj5RSRo=
+golang.org/x/sys v0.0.0-20210104204734-6f8348627aad/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/term v0.0.0-20201117132131-f5c789dd3221 h1:/ZHdbVpdR/jk3g30/d4yUL0JU9kksj8+F/bnQUVLGDM=
+golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
+golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf h1:MZ2shdL+ZM/XzY3ZGOnh4Nlpnxz5GSOhOmtHo3iPU6M=
+golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/helper/useragents.go b/helper/useragents.go
index 284d629..64d51fe 100644
--- a/helper/useragents.go
+++ b/helper/useragents.go
@@ -1,8 +1,8 @@
 package helper
 
 import (
-	"math/rand"
-	"time"
+	"crypto/rand"
+	"math/big"
 )
 
 var userAgents = [...]string{
@@ -4666,7 +4666,10 @@ var userAgents = [...]string{
 }
 
 // GetRandomUserAgent picks a random user agent from a predefined list
-func GetRandomUserAgent() string {
-	rand.Seed(time.Now().Unix())
-	return userAgents[rand.Intn(len(userAgents))]
+func GetRandomUserAgent() (string, error) {
+	n, err := rand.Int(rand.Reader, big.NewInt(int64(len(userAgents))))
+	if err != nil {
+		return "", err
+	}
+	return userAgents[n.Int64()], err
 }
diff --git a/libgobuster/helpers.go b/libgobuster/helpers.go
index 64eba6a..d8ec090 100644
--- a/libgobuster/helpers.go
+++ b/libgobuster/helpers.go
@@ -2,6 +2,7 @@ package libgobuster
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"sort"
@@ -116,7 +117,7 @@ func lineCounter(r io.Reader) (int, error) {
 		count += bytes.Count(buf[:c], lineSep)
 
 		switch {
-		case err == io.EOF:
+		case errors.Is(err, io.EOF):
 			return count, nil
 
 		case err != nil:
diff --git a/libgobuster/http.go b/libgobuster/http.go
index 6b27641..d574d5c 100644
--- a/libgobuster/http.go
+++ b/libgobuster/http.go
@@ -29,6 +29,7 @@ type HTTPClient struct {
 	headers          []HTTPHeader
 	cookies          string
 	method           string
+	host             string
 }
 
 // RequestOptions is used to pass options to a single individual request
@@ -87,6 +88,13 @@ func NewHTTPClient(c context.Context, opt *HTTPOptions) (*HTTPClient, error) {
 	if client.method == "" {
 		client.method = http.MethodGet
 	}
+	// Host header needs to be set separately
+	for _, h := range opt.Headers {
+		if h.Name == "Host" {
+			client.host = h.Value
+			break
+		}
+	}
 	return &client, nil
 }
 
@@ -136,8 +144,11 @@ func (client *HTTPClient) makeRequest(fullURL, host string, data io.Reader) (*ht
 		req.Header.Set("Cookie", client.cookies)
 	}
 
+	// Use host for VHOST mode on a per request basis, otherwise the one provided from headers
 	if host != "" {
 		req.Host = host
+	} else if client.host != "" {
+		req.Host = client.host
 	}
 
 	if client.userAgent != "" {
diff --git a/libgobuster/http_test.go b/libgobuster/http_test.go
index 62d588a..4a17945 100644
--- a/libgobuster/http_test.go
+++ b/libgobuster/http_test.go
@@ -3,8 +3,9 @@ package libgobuster
 import (
 	"bytes"
 	"context"
+	"crypto/rand"
 	"fmt"
-	"math/rand"
+	"math/big"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -26,19 +27,26 @@ func httpServerT(t *testing.T, content string) *httptest.Server {
 	return ts
 }
 
-func randomString(length int) string {
+func randomString(length int) (string, error) {
 	var letter = []byte("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
 	letterLen := len(letter)
 
 	b := make([]byte, length)
 	for i := range b {
-		b[i] = letter[rand.Intn(letterLen)]
+		n, err := rand.Int(rand.Reader, big.NewInt(int64(letterLen)))
+		if err != nil {
+			return "", err
+		}
+		b[i] = letter[n.Int64()]
 	}
-	return string(b)
+	return string(b), nil
 }
 
 func TestRequest(t *testing.T) {
-	ret := randomString(100)
+	ret, err := randomString(100)
+	if err != nil {
+		t.Fatal(err)
+	}
 	h := httpServerT(t, ret)
 	defer h.Close()
 	var o HTTPOptions
@@ -62,7 +70,11 @@ func TestRequest(t *testing.T) {
 }
 
 func BenchmarkRequestWithoutBody(b *testing.B) {
-	h := httpServerB(b, randomString(10000))
+	r, err := randomString(10000)
+	if err != nil {
+		b.Fatal(err)
+	}
+	h := httpServerB(b, r)
 	defer h.Close()
 	var o HTTPOptions
 	c, err := NewHTTPClient(context.Background(), &o)
@@ -78,7 +90,11 @@ func BenchmarkRequestWithoutBody(b *testing.B) {
 }
 
 func BenchmarkRequestWitBody(b *testing.B) {
-	h := httpServerB(b, randomString(10000))
+	r, err := randomString(10000)
+	if err != nil {
+		b.Fatal(err)
+	}
+	h := httpServerB(b, r)
 	defer h.Close()
 	var o HTTPOptions
 	c, err := NewHTTPClient(context.Background(), &o)
@@ -94,7 +110,11 @@ func BenchmarkRequestWitBody(b *testing.B) {
 }
 
 func BenchmarkNewHTTPClient(b *testing.B) {
-	h := httpServerB(b, randomString(500))
+	r, err := randomString(500)
+	if err != nil {
+		b.Fatal(err)
+	}
+	h := httpServerB(b, r)
 	defer h.Close()
 	var o HTTPOptions
 	for x := 0; x < b.N; x++ {