CVE-2021-40530 · cross-distro fix matrix

CVE-2021-40530: The ElGamal implementation in Crypto++ through 8.5 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's epheme

Affects 2 Linux releases across 2 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-40530 has a known fix. Run the listed command on that distro to remediate.

Debian bookworm

Source: Debian Security Tracker

libcrypto++→ fixed in8.6.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libcrypto++
```

Debian trixie

Source: Debian Security Tracker

libcrypto++→ fixed in8.6.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libcrypto++
```

Are YOU affected by CVE-2021-40530?

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

CVE-2021-40530dropped silently in your distro's update channel. Every new CVE is the same story. StackPatch runs the matcher hourly against all 5 sources and emails the exact remediation when something new applies to one of your servers. $99 lifetime, 50 founder seats, 30-day refund.

See StackPatch ($99 lifetime)