CVE-2021-41201

Description

TensorFlow is an open source platform for machine learning. In affeced versions during execution, `EinsumHelper::ParseEquation()` is supposed to set the flags in `input_has_ellipsis` vector and `*output_has_ellipsis` boolean to indicate whether there is ellipsis in the corresponding inputs and output. However, the code only changes these flags to `true` and never assigns `false`. This results in unitialized variable access if callers assume that `EinsumHelper::ParseEquation()` always sets these flags. The fix will be included in TensorFlow 2.7.0. We will also cherrypick this commit on TensorFlow 2.6.1, TensorFlow 2.5.2, and TensorFlow 2.4.4, as these are also affected and still in supported range.

How to fix CVE-2021-41201

To remediate CVE-2021-41201, upgrade the affected package to a fixed version below.

—upgrade to 2.4.4 or later
—upgrade to 2.6.1 or later
—upgrade to f09caa532b6e1ac8d2aa61b7832c78c5b79300c6 or later
—upgrade to f09caa532b6e1ac8d2aa61b7832c78c5b79300c6 or later
—upgrade to 2.6.1 or later
—upgrade to f09caa532b6e1ac8d2aa61b7832c78c5b79300c6 or later
—upgrade to 2.6.1 or later

Is CVE-2021-41201 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (7)

from 0, < 2.4.4, >= 2.5.0, < 2.5.2, >= 2.6.0, < 2.6.1
>= 2.6.0, < 2.6.1
from 0, < f09caa532b6e1ac8d2aa61b7832c78c5b79300c6 | from 0, < 2.4.4, >= 2.5.0, < 2.5.2, >= 2.6.0, < 2.6.1, >= 2.7.0rc0, < 2.7.0
from 0, < f09caa532b6e1ac8d2aa61b7832c78c5b79300c6 | from 0, < 2.4.4, >= 2.5.0, < 2.5.2, >= 2.6.0, < 2.6.1, >= 2.7.0rc0, < 2.7.0
>= 2.6.0, < 2.6.1
from 0, < f09caa532b6e1ac8d2aa61b7832c78c5b79300c6 | from 0, < 2.4.4, >= 2.5.0, < 2.5.2, >= 2.6.0, < 2.6.1, >= 2.7.0rc0, < 2.7.0
>= 2.6.0, < 2.6.1

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 4.0	—	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
osv	CVSS 3.1	HIGH7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H