diff -Nru libexif-0.6.21/debian/changelog libexif-0.6.21/debian/changelog
--- libexif-0.6.21/debian/changelog	2020-06-08 14:55:38.000000000 +0000
+++ libexif-0.6.21/debian/changelog	2020-11-06 15:14:21.000000000 +0000
@@ -1,3 +1,12 @@
+libexif (0.6.21-6ubuntu0.4) focal-security; urgency=medium
+
+  * SECURITY UPDATE: Buffer overflow
+    - debian/patches/CVE-2020-0452.patch: fixed a incorrect overflow check that could be
+      optimized away in libexif/exif-entry.c.
+    - CVE-2020-0452
+
+ -- Leonidas S. Barbosa <leo.barbosa@canonical.com>  Fri, 06 Nov 2020 12:14:21 -0300
+
 libexif (0.6.21-6ubuntu0.3) focal-security; urgency=medium
 
   * SECURITY UPDATE: Out of bounds read
diff -Nru libexif-0.6.21/debian/patches/CVE-2020-0452.patch libexif-0.6.21/debian/patches/CVE-2020-0452.patch
--- libexif-0.6.21/debian/patches/CVE-2020-0452.patch	1970-01-01 00:00:00.000000000 +0000
+++ libexif-0.6.21/debian/patches/CVE-2020-0452.patch	2020-11-06 15:14:10.000000000 +0000
@@ -0,0 +1,37 @@
+Backported of:
+
+From 9266d14b5ca4e29b970fa03272318e5f99386e06 Mon Sep 17 00:00:00 2001
+From: Marcus Meissner <marcus@jet.franken.de>
+Date: Thu, 5 Nov 2020 09:50:08 +0100
+Subject: [PATCH] fixed a incorrect overflow check that could be optimized
+ away.
+
+inspired by:
+https://android.googlesource.com/platform/external/libexif/+/8e7345f3bc0bad06ac369d6cbc1124c8ceaf7d4b
+
+https://source.android.com/security/bulletin/2020-11-01
+
+CVE-2020-0452
+Index: libexif-0.6.21/libexif/exif-entry.c
+===================================================================
+--- libexif-0.6.21.orig/libexif/exif-entry.c
++++ libexif-0.6.21/libexif/exif-entry.c
+@@ -28,6 +28,7 @@
+ #include <ctype.h>
+ #include <stdlib.h>
+ #include <stdio.h>
++#include <stdint.h>
+ #include <string.h>
+ #include <time.h>
+ #include <math.h>
+@@ -1376,8 +1377,8 @@ exif_entry_get_value (ExifEntry *e, char
+ 	case EXIF_TAG_XP_KEYWORDS:
+ 	case EXIF_TAG_XP_SUBJECT:
+ 	{
+-		/* Sanity check the size to prevent overflow */
+-		if (e->size+sizeof(unsigned short) < e->size) break;
++		/* Sanity check the size to prevent overflow. Note EXIF files are 64kb at most. */
++		if (e->size >= 65536 - sizeof(uint16_t)*2) break;
+ 
+ 		/* The tag may not be U+0000-terminated , so make a local
+ 		   U+0000-terminated copy before converting it */
diff -Nru libexif-0.6.21/debian/patches/series libexif-0.6.21/debian/patches/series
--- libexif-0.6.21/debian/patches/series	2020-06-08 14:55:38.000000000 +0000
+++ libexif-0.6.21/debian/patches/series	2020-11-06 15:14:10.000000000 +0000
@@ -16,3 +16,4 @@
 CVE-2020-13114.patch
 CVE-2020-0182.patch
 CVE-2020-0198.patch
+CVE-2020-0452.patch