CVE-2017-7229: PGP/MIME encrypted messages injected into a Vaultive O365 (before 4.5.21) frontend via IMAP or SMTP have their

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CRITICAL 9.1REMOTEDOWNGRADE

CVE-2017-7229 is a critical-severity flaw (CVSS 9.1) affecting office 365 security. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PGP/MIME encrypted messages injected into a Vaultive O365 (before 4.5.21) frontend via IMAP or SMTP have their Content-Type changed from 'Content-Type: multipart/encrypted; protocol="application/pgp-encrypted"; boundary="abc123abc123"' to 'Content-Type: text/plain' - this results in the encrypted message being structured in such a way that most PGP/MIME-capable mail user agents are unable to decrypt it cleanly. The outcome is that encrypted mail

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-326
Published	2017-05-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: vaultive

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

Am I affected?

Timeline

2017-05-03 20:59 UTCPublished CVE record published
2026-06-17 01:23 UTCUpdated Record last modified

vaultive office 365 security DOWNGRADE

Affected: 4.5.19

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.5.19

1. Check installed version

apt-cache policy office-365-security || rpm -q office-365-security || office-365-security --version

2. No fixed release: DOWNGRADE to a release before 4.5.19 (Debian / Ubuntu)

apt-cache madison office-365-security sudo apt install office-365-security=<VERSION_BEFORE_4.5.19> sudo apt-mark hold office-365-security

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list office-365-security sudo dnf downgrade office-365-security-<VERSION_BEFORE_4.5.19> sudo dnf versionlock add office-365-security

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-2017-7229?

office 365 security: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-7229 being exploited?

CVE-2017-7229 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-2017-7229 affect?

CVE-2017-7229 affects office 365 security. Severity is critical (CVSS 9.1). PGP/MIME encrypted messages injected into a Vaultive O365 (before 4.5.21) frontend via IMAP or SMTP have their Content-Type changed from 'Content-Type: multipart/encrypted; protocol="application/pgp-encrypted"; boundary="abc123abc123"' to '

How urgent is CVE-2017-7229?

Priority 51/100. Critical severity; Remotely exploitable, no login, no user action

References

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