CVE-2017-17688
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
02 Description
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
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 5.44% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 92.6% of scored records. A rank, not a probability.
- NVD base score
- 5.9 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2018-05-16 19:00Z8 YR AGO
- Last updated
- 2024-08-05 20:59Z2 YR AGO
- Reserved
- 2017-12-15
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-200Exposure of Sensitive Information to an Unauthorized ActorClass
- Data version
- 5.1
- Document digest
- 56e4671f6e079dd0f042a3d12ebfd5e97a73f752a42f23461d1c7a359ee985d1
05 Affected products
06 References
- protonmail.comhttps://protonmail.com/blog/pgp-vulnerability-efail
- news.ycombinator.comhttps://news.ycombinator.com/item?id=17066419
- www.patreon.comhttps://www.patreon.com/posts/cybersecurity-15-18814817
- flaked.sockpuppet.orghttp://flaked.sockpuppet.org/2018/05/16/a-unified-timeline.html
- www.securityfocus.com104162http://www.securityfocus.com/bid/104162
- lists.gnupg.orghttps://lists.gnupg.org/pipermail/gnupg-users/2018-May/060334.html
- efail.dehttps://efail.de
- twitter.comhttps://twitter.com/matthew_d_green/status/995996706457243648
- www.synology.comhttps://www.synology.com/support/security/Synology_SA_18_22
- www.securitytracker.com1040904http://www.securitytracker.com/id/1040904
07 Fixed in
Debian 11
- enigmail Fixed in 2:2.0.6.1-4
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.