diff --git a/CVE-2020-11945.patch b/CVE-2020-11945.patch
new file mode 100644
index 0000000000000000000000000000000000000000..649b3fc5d2fb983e946c6f02277f1a331f9d6234
--- /dev/null
+++ b/CVE-2020-11945.patch
@@ -0,0 +1,63 @@
+commit eeebf0f37a72a2de08348e85ae34b02c34e9a811
+Author: desbma-s1n <62935004+desbma-s1n@users.noreply.github.com>
+Date:   2020-04-02 11:16:45 +0000
+
+    Fix auth digest refcount integer overflow (#585)
+    
+    This fixes a possible overflow of the nonce reference counter in the
+    digest authentication scheme, found by security researchers
+    @synacktiv.
+    
+    It changes `references` to be an 64 bits unsigned integer. This makes
+    overflowing the counter impossible in practice.
+
+diff --git a/src/auth/digest/Config.cc b/src/auth/digest/Config.cc
+index fdef7df..9deb184 100644
+--- a/src/auth/digest/Config.cc
++++ b/src/auth/digest/Config.cc
+@@ -94,9 +94,6 @@ static void authenticateDigestNonceDelete(digest_nonce_h * nonce);
+ static void authenticateDigestNonceSetup(void);
+ static void authDigestNonceEncode(digest_nonce_h * nonce);
+ static void authDigestNonceLink(digest_nonce_h * nonce);
+-#if NOT_USED
+-static int authDigestNonceLinks(digest_nonce_h * nonce);
+-#endif
+ static void authDigestNonceUserUnlink(digest_nonce_h * nonce);
+ 
+ static void
+@@ -289,21 +286,10 @@ authDigestNonceLink(digest_nonce_h * nonce)
+ {
+     assert(nonce != NULL);
+     ++nonce->references;
++    assert(nonce->references != 0); // no overflows
+     debugs(29, 9, "nonce '" << nonce << "' now at '" << nonce->references << "'.");
+ }
+ 
+-#if NOT_USED
+-static int
+-authDigestNonceLinks(digest_nonce_h * nonce)
+-{
+-    if (!nonce)
+-        return -1;
+-
+-    return nonce->references;
+-}
+-
+-#endif
+-
+ void
+ authDigestNonceUnlink(digest_nonce_h * nonce)
+ {
+diff --git a/src/auth/digest/Config.h b/src/auth/digest/Config.h
+index 56ccaa9..7fb7673 100644
+--- a/src/auth/digest/Config.h
++++ b/src/auth/digest/Config.h
+@@ -42,7 +42,7 @@ struct _digest_nonce_h : public hash_link {
+     /* number of uses we've seen of this nonce */
+     unsigned long nc;
+     /* reference count */
+-    short references;
++    uint64_t references;
+     /* the auth_user this nonce has been tied to */
+     Auth::Digest::User *user;
+     /* has this nonce been invalidated ? */
diff --git a/squid.spec b/squid.spec
index 7d3e90d85cd48aead9d55f9c0ef63f0589e76160..2bde7c08a0074b2126b4aa2a606b7a009bbbbc4f 100644
--- a/squid.spec
+++ b/squid.spec
@@ -2,7 +2,7 @@
 
 Name:     squid
 Version:  4.9
-Release:  4
+Release:  5
 Summary:  The Squid proxy caching server
 Epoch:    7
 License:  GPLv2+ and (LGPLv2+ and MIT and BSD and Public Domain)
@@ -27,6 +27,7 @@ Patch6: CVE-2020-8517.patch
 Patch7: CVE-2020-8449_CVE-2020-8450.patch
 Patch8: squid-fix-detection-of-sys-sysctl.h-detection-511.patch
 Patch9: CVE-2019-12519.patch
+Patch10:CVE-2020-11945.patch
 
 Buildroot: %{_tmppath}/squid-4.9-1-root-%(%{__id_u} -n)
 Requires: bash >= 2.0
@@ -205,6 +206,12 @@ fi
     chgrp squid /var/cache/samba/winbindd_privileged >/dev/null 2>&1 || :
 
 %changelog
+* Mon Mar 8 2021 openEuler Buildteam <buildteam@openeuler.org> - 4.9-5
+- Type:cves
+- ID:CVE-2020-11945
+- SUG:restart
+- DESC:fix CVE-2020-11945
+
 * Mon Jan 11 2021 openEuler Buildteam <buildteam@openeuler.org> - 4.9-4
 - Type:cves
 - ID:CVE-2019-12519