CVE-2022-48521: An issue was discovered in OpenDKIM through 2.10.3, and 2.11.x through 2.11.0-Beta2

Q: How do I fix CVE-2022-48521?

opendkim: upgrade to newer than 2.10.3. Exact commands for each OS are on this page.

Q: Is CVE-2022-48521 being exploited?

CVE-2022-48521 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-48521 affect?

CVE-2022-48521 affects opendkim. Severity is medium (CVSS 5.3). An issue was discovered in OpenDKIM through 2.10.3, and 2.11.x through 2.11.0-Beta2. It fails to keep track of ordinal numbers when removing fake Authentication-Results header fields, which allows a remote attacker to craft an e-mail messag

Q: How urgent is CVE-2022-48521?

Priority 37/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2022-48521 is a medium-severity flaw (CVSS 5.3) affecting opendkim. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in OpenDKIM through 2.10.3, and 2.11.x through 2.11.0-Beta2. It fails to keep track of ordinal numbers when removing fake Authentication-Results header fields, which allows a remote attacker to craft an e-mail message with a fake sender address such that programs that rely on Authentication-Results from OpenDKIM will treat the message as having a valid DKIM signature when in fact it has none.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Published	2023-07-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: opendkim

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

Am I affected?

Timeline

2023-07-11 20:15 UTCPublished CVE record published
2026-06-17 05:15 UTCUpdated Record last modified

opendkim opendkim UPGRADE

Affected: <= 2.10.3 · 2.11.0 beta0 · 2.11.0 beta1 · 2.11.0 beta2

Fixed in: newer than 2.10.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.10.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opendkim

Note

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

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-2022-48521?

opendkim: upgrade to newer than 2.10.3. Exact commands for each OS are on this page.

Is CVE-2022-48521 being exploited?

CVE-2022-48521 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-2022-48521 affect?

CVE-2022-48521 affects opendkim. Severity is medium (CVSS 5.3). An issue was discovered in OpenDKIM through 2.10.3, and 2.11.x through 2.11.0-Beta2. It fails to keep track of ordinal numbers when removing fake Authentication-Results header fields, which allows a remote attacker to craft an e-mail messag

How urgent is CVE-2022-48521?

Priority 37/100. Remotely exploitable, no login, no user action

References

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