Skip to content
Noroxi
CVE-2017-17688· NVD / CVE Program· CNA mitre

The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration,

The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL. NOTE: third parties report that this is a problem in applications that mishandle the Modification Detection Code (MDC) feature or accept an obsolete packet type, not a problem in the OpenPGP specification

MediumCVSS 5.9 · v3.0—No exploit Fix available
Published
May 16, 2018
Updated
Jun 16, 2026
EPSS
5.5% · 93th percentile
CWE
—
Follow this CVE

Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.

Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 5.5%

Affected systems

VendorProduct
applemail
bloopairmail
emclientemclient
flipdogsolutionsmaildroid
freronmailmate
hordehorde imp
microsoftoutlook
mozillathunderbird
postbox-incpostbox
r2mail2r2mail2
roundcubewebmail

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • roundcube webmailall versions

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:11enigmailbefore 2:2.0.6.1-42:2.0.6.1-4
openSUSE:Tumbleweedenigmailbefore 2.2.4-1.42.2.4-1.4
SUSE:Package Hub 12enigmailbefore 2.0.4-9.12.0.4-9.1

Same product

apple: all records

Other highest-scoring records for the same primary product.

  • CVE-2005-1505The new account wizard in Mail.app 2.0 in Mac OS 10.4, when configuring an IMAP mail account and checking the credentials, does not prompt t
    30Monitor
  • CVE-2008-4491Apple Mail.app 3.5 on Mac OS X, when "Store draft messages on the server" is enabled, stores draft copies of S/MIME email in plaintext on th
    20Monitor
  • CVE-2010-3887The Limit Mail feature in the Parental Controls functionality in Mail on Apple Mac OS X does not properly enforce the correspondence whiteli
    17Monitor
  • CVE-2005-2512Mail.app in Mac OS 10.4.2 and earlier, when printing or forwarding an HTML message, loads remote images even when the user's preferences sta
    8Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:enigmail2:2.0.6.1-4 · Debian:11Package registry (OSV)
opensuse:enigmail2.2.4-1.4 · openSUSE:TumbleweedPackage registry (OSV)
suse:enigmail2.0.4-9.1 · SUSE:Package Hub 12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

—

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records