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CVE-2021-3697

HIGHCVSS 7/10EPSS 0.43%

Last modified

CVE-2021-3697 is a high-severity vulnerability rated 7/10 on the CVSS scale. A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. EPSS estimates a 0.43% chance of exploitation in the next 30 days.

Description

A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.

Metrics

CVSS 3.1
7/10

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

EPSS Probability
0.43%

34.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
GnuGrub2>= 2.00, < 2.12
RedhatDeveloper Tools1.0
RedhatOpenshift3.0
RedhatEnterprise Linux8.0
RedhatEnterprise Linux8.1
RedhatEnterprise Linux8.4
RedhatEnterprise Linux9.0
RedhatEnterprise Linux Eus8.2
RedhatEnterprise Linux Eus8.4
RedhatEnterprise Linux Eus8.6
RedhatEnterprise Linux Eus9.0
RedhatEnterprise Linux For Power Little Endian8.0
RedhatEnterprise Linux For Power Little Endian9.0
RedhatEnterprise Linux For Power Little Endian Eus8.2
RedhatEnterprise Linux For Power Little Endian Eus8.4
RedhatEnterprise Linux For Power Little Endian Eus8.6
RedhatEnterprise Linux For Power Little Endian Eus9.0
RedhatEnterprise Linux Server Aus8.2
RedhatEnterprise Linux Server Aus8.4
RedhatEnterprise Linux Server Aus8.6
RedhatEnterprise Linux Server For Power Little Endian Update Services For Sap Solutions8.1
RedhatEnterprise Linux Server For Power Little Endian Update Services For Sap Solutions8.2
RedhatEnterprise Linux Server For Power Little Endian Update Services For Sap Solutions8.4
RedhatEnterprise Linux Server For Power Little Endian Update Services For Sap Solutions8.6
RedhatEnterprise Linux Server For Power Little Endian Update Services For Sap Solutions9.0
RedhatEnterprise Linux Server Tus8.2
RedhatEnterprise Linux Server Tus8.4
RedhatEnterprise Linux Server Tus8.6
RedhatOpenshift Container Platform4.6
RedhatOpenshift Container Platform4.9
RedhatOpenshift Container Platform4.10
RedhatCodeready Linux BuilderAll versions

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-3697?
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
How severe is CVE-2021-3697?
CVE-2021-3697 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3697?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3697?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST