CVE-2020-7845: Spamsniper 5.0 ~ 5.2.7 contain a stack-based buffer overflow vulnerability caused by improper boundary checks

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HIGH 8.1REMOTEUPGRADE

CVE-2020-7845 is a high-severity flaw (CVSS 8.1) affecting spamsniper. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Spamsniper 5.0 ~ 5.2.7 contain a stack-based buffer overflow vulnerability caused by improper boundary checks when parsing MAIL FROM command. It leads remote attacker to execute arbitrary code via crafted packet.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	2.8% (top 14%)
CISA exploited list	No
Weakness	CWE-121, CWE-787
Published	2020-12-27
Last modified	2026-06-17

Publisher (CNA): KrCERT/CC · Vendor: jiransecurity

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-12-27 02:15 UTCPublished CVE record published
2026-06-17 03:25 UTCUpdated Record last modified

jiransecurity spamsniper UPGRADE

Affected: >= 5.0.2 and < 5.7.6

Fixed in: 5.7.6

Safe to downgrade to: a release before 5.0.2

1. Check installed version

apt-cache policy spamsniper || rpm -q spamsniper || spamsniper --version

2. UPGRADE to 5.7.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade spamsniper

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spamsniper

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.0.2 (Debian / Ubuntu)

apt-cache madison spamsniper sudo apt install spamsniper=<VERSION_BEFORE_5.0.2> sudo apt-mark hold spamsniper

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list spamsniper sudo dnf downgrade spamsniper-<VERSION_BEFORE_5.0.2> sudo dnf versionlock add spamsniper

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-7845?

spamsniper: upgrade to 5.7.6. Exact commands for each OS are on this page.

Is CVE-2020-7845 being exploited?

CVE-2020-7845 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-7845 affect?

CVE-2020-7845 affects spamsniper. Severity is high (CVSS 8.1). Spamsniper 5.0 ~ 5.2.7 contain a stack-based buffer overflow vulnerability caused by improper boundary checks when parsing MAIL FROM command. It leads remote attacker to execute arbitrary code via crafted packet.

How urgent is CVE-2020-7845?

Priority 55/100. High severity; Remotely exploitable, no login, no user action

References

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