CVE-2021-3697 · cross-distro fix matrix

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

Affects 8 Linux releases across 8 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-3697 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

grub2→ fixed in2.06-3~deb11u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y grub2
```

Debian bookworm

Source: Debian Security Tracker

grub2→ fixed in2.06-3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y grub2
```

Debian trixie

Source: Debian Security Tracker

grub2→ fixed in2.06-3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y grub2
```

Alpine v3.20

Source: Alpine secdb

grub→ fixed in2.06-r13
```
apk update && apk add --upgrade grub
```

Alpine v3.21

Source: Alpine secdb

grub→ fixed in2.06-r13
```
apk update && apk add --upgrade grub
```

Alpine edge

Source: Alpine secdb

grub→ fixed in2.06-r13
```
apk update && apk add --upgrade grub
```

Alpine v3.18

Source: Alpine secdb

grub→ fixed in2.06-r12
```
apk update && apk add --upgrade grub
```

Alpine v3.19

Source: Alpine secdb

grub→ fixed in2.06-r13
```
apk update && apk add --upgrade grub
```

Are YOU affected by CVE-2021-3697?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

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