CVE-2010-4533: offlineimap before 6.3.4 added support for SSL server certificate validation but it is still possible to use S

Q: How do I fix CVE-2010-4533?

debian linux: mitigate or apply the listed mitigation; offlineimap: upgrade to 6.3.4. Exact commands for each OS are on this page.

Q: Is CVE-2010-4533 being exploited?

CVE-2010-4533 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-2010-4533 affect?

CVE-2010-4533 affects debian linux, offlineimap. Severity is critical (CVSS 9.8). offlineimap before 6.3.4 added support for SSL server certificate validation but it is still possible to use SSL v2 protocol, which is a flawed protocol with multiple security deficiencies.

Q: How urgent is CVE-2010-4533?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.8REMOTEWATCHLISTMITIGATEUPGRADE

CVE-2010-4533 is a critical-severity flaw (CVSS 9.8) affecting debian linux, offlineimap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

offlineimap before 6.3.4 added support for SSL server certificate validation but it is still possible to use SSL v2 protocol, which is a flawed protocol with multiple security deficiencies.

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-295
Published	2019-11-13
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: debian · offlineimap

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-11-13 19:15 UTCPublished CVE record published
2026-06-16 23:24 UTCUpdated Record last modified

debian debian linux MITIGATE

Affected: 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

offlineimap offlineimap UPGRADE

Affected: < 6.3.4

Fixed in: 6.3.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 6.3.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade offlineimap

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-2010-4533?

debian linux: mitigate or apply the listed mitigation; offlineimap: upgrade to 6.3.4. Exact commands for each OS are on this page.

Is CVE-2010-4533 being exploited?

CVE-2010-4533 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-2010-4533 affect?

CVE-2010-4533 affects debian linux, offlineimap. Severity is critical (CVSS 9.8). offlineimap before 6.3.4 added support for SSL server certificate validation but it is still possible to use SSL v2 protocol, which is a flawed protocol with multiple security deficiencies.

How urgent is CVE-2010-4533?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

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References

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