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CVE-2021-37685— Heap OOB in TensorFlow Lite

Quick assessment

Affected

tensorflow tensorflow

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google TensorFlow是美国谷歌（Google）公司的一套用于机器学习的端到端开源平台。 Google TensorFlow 存在缓冲区错误漏洞，该漏洞源于TensorFlow 可能允许本地经过身份验证的攻击者获取敏感信息，这是由 TFLite 中 expand_dims.cc 中的堆越界读取缺陷引起的。通过发送特制的请求，攻击者可以利用此漏洞读取堆分配数据边界之外的一个元素，并使用此信息对受影响的系统发起进一步攻击。

CVSS 5.5 · Medium EPSS 0.17% · P7 Updated Feb 25, 2026

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

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I. Basic Information for CVE-2021-37685

Vulnerability Information

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Vulnerability Title

Heap OOB in TensorFlow Lite

Source: CVE Program / CVE List V5

Vulnerability Description

TensorFlow is an end-to-end open source platform for machine learning. In affected versions TFLite's [`expand_dims.cc`](https://github.com/tensorflow/tensorflow/blob/149562d49faa709ea80df1d99fc41d005b81082a/tensorflow/lite/kernels/expand_dims.cc#L36-L50) contains a vulnerability which allows reading one element outside of bounds of heap allocated data. If `axis` is a large negative value (e.g., `-100000`), then after the first `if` it would still be negative. The check following the `if` statement will pass and the `for` loop would read one element before the start of `input_dims.data` (when `i = 0`). We have patched the issue in GitHub commit d94ffe08a65400f898241c0374e9edc6fa8ed257. The fix will be included in TensorFlow 2.6.0. We will also cherrypick this commit on TensorFlow 2.5.1, TensorFlow 2.4.3, and TensorFlow 2.3.4, as these are also affected and still in supported range.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存读

Source: CVE Program / CVE List V5

Vulnerability Title

Google TensorFlow 缓冲区错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
tensorflow	tensorflow	>= 2.5.0, < 2.5.1	-

II. Public POCs for CVE-2021-37685

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III. Intelligence Information for CVE-2021-37685

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Patches & Fixes for CVE-2021-37685 (1)

https://github.com/tensorflow/tensorflow/commit/d94ffe08a65400f898241c0374e9edc6fa8ed257 x_refsource_MISC

Vendor Advisories for CVE-2021-37685 (1)

https://github.com/tensorflow/tensorflow/security/advisories/GHSA-c545-c4f9-rf6v x_refsource_CONFIRM

https://www.cve.org/CVERecord?id=CVE-2021-37685

Same Patch Batch · tensorflow · 2021-08-12 · 58 CVEs total

CVE-2021-37678	9.3 CRITICAL	Arbitrary code execution due to YAML deserialization
CVE-2021-37639	8.4 HIGH	Null pointer dereference and heap OOB read in TensorFlow
CVE-2021-37689	7.8 HIGH	Null pointer dereference in TensorFlow Lite MLIR optimizations
CVE-2021-37665	7.8 HIGH	Incomplete validation in MKL requantization in TensorFlow
CVE-2021-37663	7.8 HIGH	Incomplete validation in `QuantizeV2` in TensorFlow
CVE-2021-37681	7.8 HIGH	Null pointer exception in TensorFlow Lite
CVE-2021-37648	7.8 HIGH	Incorrect validation of `SaveV2` inputs in TensorFlow
CVE-2021-37688	7.8 HIGH	Null pointer dereference in TensorFlow Lite
CVE-2021-37676	7.8 HIGH	Reference binding to nullptr in shape inference in TensorFlow
CVE-2021-37671	7.8 HIGH	Reference binding to nullptr in map operations in TensorFlow
CVE-2021-37666	7.8 HIGH	Reference binding to nullptr in `RaggedTensorToVariant` in TensorFlow
CVE-2021-37667	7.8 HIGH	Reference binding to nullptr in unicode encoding in TensorFlow
CVE-2021-37652	7.8 HIGH	Use after free in boosted trees creation in TensorFlow
CVE-2021-37650	7.8 HIGH	Segfault and heap buffer overflow in `{Experimental,}DatasetToTFRecord` in TensorFlow
CVE-2021-37643	7.7 HIGH	Null pointer dereference in `MatrixDiagPartOp` in TensorFlow
CVE-2021-37647	7.7 HIGH	Null pointer dereference in `SparseTensorSliceDataset` in TensorFlow
CVE-2021-37638	7.7 HIGH	Null pointer dereference in `RaggedTensorToTensor` in TensorFlow
CVE-2021-37649	7.7 HIGH	Null pointer dereference in `UncompressElement` in TensorFlow
CVE-2021-37637	7.7 HIGH	Null pointer dereference in `CompressElement` in TensorFlow
CVE-2021-37664	7.3 HIGH	Heap OOB in boosted trees in TensorFlow

Showing top 20 of 58 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: tensorflow

Same vendor: tensorflow

Same weakness: CWE-125