diff --git a/CVE-2021-38171.patch b/CVE-2021-38171.patch
new file mode 100644
index 0000000..20ac857
--- /dev/null
+++ b/CVE-2021-38171.patch
@@ -0,0 +1,30 @@
+From 98461501f4272822c310e18d74d5dc3e4b51631f Mon Sep 17 00:00:00 2001
+From: maryam ebrahimzadeh <me22bee@outlook.com>
+Date: Tue, 2 Jul 2024 15:50:54 +0800
+Subject: [PATCH] CVE-2021-38171
+
+---
+ libavformat/adtsenc.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/libavformat/adtsenc.c b/libavformat/adtsenc.c
+index 3c2840c..3807d67 100644
+--- a/libavformat/adtsenc.c
++++ b/libavformat/adtsenc.c
+@@ -50,9 +50,11 @@ static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const ui
+     GetBitContext gb;
+     PutBitContext pb;
+     MPEG4AudioConfig m4ac;
+-    int off;
++    int off, ret;
+ 
+-    init_get_bits(&gb, buf, size * 8);
++    ret = init_get_bits8(&gb, buf, size);
++    if (ret < 0)
++        return ret;
+     off = avpriv_mpeg4audio_get_config(&m4ac, buf, size * 8, 1);
+     if (off < 0)
+         return off;
+-- 
+2.43.0
+
diff --git a/ffmpeg.spec b/ffmpeg.spec
index 5c28d1f..f277d8c 100644
--- a/ffmpeg.spec
+++ b/ffmpeg.spec
@@ -61,7 +61,7 @@ ExclusiveArch: armv7hnl
 Summary:        Digital VCR and streaming server
 Name:           ffmpeg%{?flavor}
 Version:        4.2.4
-Release:        11
+Release:        12
 License:        %{ffmpeg_license}
 URL:            http://ffmpeg.org/
 %if 0%{?date}
@@ -82,6 +82,7 @@ Patch9:         CVE-2022-3341.patch
 Patch10:        CVE-2022-3109.patch
 Patch11:        fix-CVE-2023-51793.patch
 Patch12:        fix-CVE-2023-50010.patch
+Patch13:        CVE-2021-38171.patch
 Requires:       %{name}-libs%{?_isa} = %{version}-%{release}
 %{?_with_cuda:BuildRequires: cuda-minimal-build-%{_cuda_version_rpm} cuda-drivers-devel}
 %{?_with_libnpp:BuildRequires: pkgconfig(nppc-%{_cuda_version})}
@@ -414,6 +415,9 @@ install -pm755 tools/qt-faststart %{buildroot}%{_bindir}
 
 
 %changelog
+* Tue Jul  2 2024 happyworker <208suo@208suo.com> - 4.2.4-12
+- Fix CVE-2021-38171
+
 * Tue Jul 02 2024 happyworker <208suo@208suo.com> - 4.2.4-11
 - Fix CVE-2023-50010