Security advisory
TensorFlow is an end-to-end open source platform for machine learning. An attacker can cause a segfault and denial of service via accessing data outside of bounds in `tf.raw_ops.QuantizedBatchNormWithGlobalNormalization`. This is because the implementation(https://github.com/tensorflow/tensorflow/blob/55a97caa9e99c7f37a0bbbeb414dc55553d3ae7f/tensorflow/core/kernels/quantized_batch_norm_op.cc#L176-L189) assumes the inputs are not empty. If any of these inputs is empty, `.flat()` is an empty buffer, so accessing the element at index 0 is accessing data outside of bounds. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow 2.1.4, as these are also affected and still in supported range.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-29547
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:44 UTC · Revision 1
Source evidence
TensorFlow is an end-to-end open source platform for machine learning. An attacker can cause a segfault and denial of service via accessing data outside of bounds in `tf.raw_ops.QuantizedBatchNormWithGlobalNormalization`. This is because the implementation(https://github.com/tensorflow/tensorflow/blob/55a97caa9e99c7f37a0bbbeb414dc55553d3ae7f/tensorflow/core/kernels/quantized_batch_norm_op.cc#L176-L189) assumes the inputs are not empty. If any of these inputs is empty, `.flat()` is an empty buffer, so accessing the element at index 0 is accessing data outside of bounds. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow 2.1.4, as these are also affected and still in supported range.
osv:CVE-2021-29547
Complete source record
{
"id": "5084481342f5af4f67549b12390eda66ef8584de79fa1178fbebf0949dd4abf8",
"url": "https://osv.dev/vulnerability/CVE-2021-29547",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-29547",
"summary": "TensorFlow is an end-to-end open source platform for machine learning. An attacker can cause a segfault and denial of service via accessing data outside of bounds in `tf.raw_ops.QuantizedBatchNormWithGlobalNormalization`. This is because the implementation(https://github.com/tensorflow/tensorflow/blob/55a97caa9e99c7f37a0bbbeb414dc55553d3ae7f/tensorflow/core/kernels/quantized_batch_norm_op.cc#L176-L189) assumes the inputs are not empty. If any of these inputs is empty, `.flat()` is an empty buffer, so accessing the element at index 0 is accessing data outside of bounds. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow 2.1.4, as these are also affected and still in supported range.",
"evidence": "osv:CVE-2021-29547",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-29547",
"aliases": [
"BIT-tensorflow-2021-29547",
"CVE-2021-29547",
"GHSA-4fg4-p75j-w5xj",
"PYSEC-2021-184",
"PYSEC-2021-475",
"PYSEC-2021-673"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/tensorflow/tensorflow",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "0931ea3d985bb9c8fdd054a5e29c4129623c849b"
},
{
"introduced": "2b96f3662bd776e277f86997659e61046b56c315"
},
{
"fixed": "cfe0c80169ae984bcdc99ff6de7444164aaa8e07"
},
{
"introduced": "b36436b087bd8e8701ef51718179037cccdfc26e"
},
{
"fixed": "3929ffacfbef7c431e8397920d040aaf47acff19"
},
{
"introduced": "582c8d236cb079023657287c318ff26adb239002"
},
{
"fixed": "1923123d32ea41d92b70a27a3f6ecf0763b56f6c"
},
{
"fixed": "d6ed5bcfe1dcab9e85a4d39931bd18d99018e75b"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.1.4"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.2.0"
},
{
"fixed": "2.2.3"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.3.0"
},
{
"fixed": "2.3.3"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.2"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "d6ed5bcfe1dcab9e85a4d39931bd18d99018e75b"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v2.1.3",
"v2.2.2",
"v2.3.2",
"v2.4.1",
"v2.1.2",
"v2.2.1",
"v2.4.0",
"v2.3.1",
"v2.2.0",
"v2.1.1",
"v2.3.0",
"v2.1.0",
"v2.1.0-rc0",
"v2.1.0-rc2",
"v2.1.0-rc1",
"v1.12.1",
"v1.9.0-rc2",
"v1.6.0-rc1",
"v1.1.0-rc2",
"v1.1.0-rc1",
"0.6.0",
"0.5.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-29547.json",
"vanir_signatures": [
{
"id": "CVE-2021-29547-9d06ae6e",
"digest": {
"threshold": 0.9,
"line_hashes": [
"176618047136456417880005532924269322386",
"297047972375586089626536842260205915101",
"86200857832530856272713735861939086941",
"128459269962812644813524439573502370374",
"234004257098849043291372428099319489604",
"241579587392670441474268375065918101774",
"161063756124405785828275356797381227591",
"37244088738306890189939361308459926176",
"316467082556001404614516698981229802163",
"135937994080295905309159847098386748770",
"167120151489323212762499174682729280990",
"219490438250623205816948631995075558366",
"242888050880428708846886754973363308772",
"72111755195317785167421845503711011011",
"131068498761825027470444422476444652228",
"185457261491039634984875476907287325232",
"238957868349673335557020188134440930668",
"227576154549641252975969184476197098428",
"181823546976821326746531119399087937682",
"77817855725171497703242639549410228571",
"121111861639199729372945519955015565610"
]
},
"source": "https://github.com/tensorflow/tensorflow/commit/d6ed5bcfe1dcab9e85a4d39931bd18d99018e75b",
"target": {
"file": "tensorflow/core/kernels/quantized_batch_norm_op.cc"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T14:24:29Z"
}
}
],
"modified": "2026-10-20T14:24:29.297726020Z",
"provider": "osv",
"references": [
"https://github.com/tensorflow/tensorflow/commit/d6ed5bcfe1dcab9e85a4d39931bd18d99018e75b",
"https://github.com/tensorflow/tensorflow/security/advisories/GHSA-4fg4-p75j-w5xj"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-29547",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388918,
"published_at": "2021-05-14T20:15:12.763+00:00"
}