CVE-2017-1000257
An IMAP FETCH response line indicates the size of the returned data, in number of bytes. When that response says the data is zero bytes, libcurl would pass on that (non-existing) data with a pointer
02 Description
An IMAP FETCH response line indicates the size of the returned data, in number of bytes. When that response says the data is zero bytes, libcurl would pass on that (non-existing) data with a pointer
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 6.22% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 93.2% of scored records. A rank, not a probability.
- NVD base score
- 9.1 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- 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
- 2017-10-31 21:00Z8 YR AGO
- Last updated
- 2026-04-15 21:02Z6 MO AGO
- Reserved
- 2017-10-31
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.1)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Weaknesses
- Data version
- 5.2
- Document digest
- 06dcd88490af1c4f1078bf4d352d7923754339b90a1994d92616e2337ec4ba3d
05 Affected products
06 References
- curl.haxx.sehttps://curl.haxx.se/docs/adv_20171023.html
- access.redhat.comRHSA-2017:3263https://access.redhat.com/errata/RHSA-2017:3263
- security.gentoo.orgGLSA-201712-04https://security.gentoo.org/glsa/201712-04
- www.securitytracker.com1039644http://www.securitytracker.com/id/1039644
- access.redhat.comRHSA-2018:3558https://access.redhat.com/errata/RHSA-2018:3558
- www.securityfocus.com101519http://www.securityfocus.com/bid/101519
- www.debian.orgDSA-4007http://www.debian.org/security/2017/dsa-4007
- access.redhat.comRHSA-2018:2486https://access.redhat.com/errata/RHSA-2018:2486
07 Fixed in
Arch Linux
- curl Fixed in 7.56.1-1
- lib32-curl Fixed in 7.56.1-1
- lib32-libcurl-compat Fixed in 7.56.1-1
- lib32-libcurl-gnutls Fixed in 7.56.1-1
- libcurl-compat Fixed in 7.56.1-1
- libcurl-gnutls Fixed in 7.56.1-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
Debian 12
- curl Fixed in 7.56.1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- curl Fixed in 7.56.1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- curl Fixed in 7.56.1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- curl Fixed in 7.35.0-1ubuntu2.12
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- curl Fixed in 7.47.0-1ubuntu2.4
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. 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.