CRITICAL
zsh: buffer overrun in symlinks
Published Feb 27, 2018
9.8
CRITICALCVSS 3.0
EPSS 3.11%
Description
In utils.c in zsh before 5.4, symlink expansion had a buffer overflow.
Affected products
No data.
Configuration 2
OR
- 14.04
- 16.04
- 17.10
No data.
Red Hat Enterprise Linux 6
zsh-0:4.3.11-8.el6
Fixed · RHSA-2018:1932
Red Hat Enterprise Linux 7
zsh-0:5.0.2-31.el7
Fixed · RHSA-2018:3073
Red Hat Enterprise Linux 5
zsh
Will not fix
Red Hat Enterprise Linux 8
zsh
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | zsh-0:4.3.11-8.el6 | Fixed | RHSA-2018:1932 |
| Red Hat Enterprise Linux 7 | zsh-0:5.0.2-31.el7 | Fixed | RHSA-2018:3073 |
| Red Hat Enterprise Linux 5 | zsh | Will not fix | n/a |
| Red Hat Enterprise Linux 8 | zsh | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
9.8 CRITICAL NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
1 other source (Red Hat) ▾
7.5 HIGH Red Hat
CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction Required
Scope Changed
Confidentiality Impact High
Integrity Impact High
Availability Impact High
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
3.11% 0.03114
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.03114
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.11% (0.03114) | 87.35th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.16% (0.03162) | 86.29th | v5 (v2026.06.15) |
| Mar 19, 2025 | 0.41% (0.00415) | 58.68th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.72% (0.00716) | 80.75th | v3 (v2023.03.01) |
| Feb 22, 2024 | 0.72% (0.00716) | 79.98th | v3 (v2023.03.01) |
| Jul 21, 2023 | 0.72% (0.00716) | 77.98th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.69% (0.00690) | 77.03th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.11% (0.01108) | 53.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.11% (0.01108) | 51.54th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.11% (0.01108) | 29.61th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.45% (0.01454) | 32.67th | v1 |
| Jan 6, 2022 | 1.45% (0.01454) | 31.96th | v1 |
| Sep 1, 2021 | 1.45% (0.01454) | 71.88th | v1 |
| Apr 14, 2021 | 1.45% (0.01454) | 0.00th | v1 |
Weaknesses (2)
References (10)
- https://access.redhat.com/errata/RHSA-2018:1932 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3073 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-18206 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1549861 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2017-18206
- https://security.gentoo.org/glsa/201805-10 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://sourceforge.net/p/zsh/code/ci/c7a9cf465dd620ef48d586026944d9bd7a0d5d6d x_refsource_MISCPatchThird Party Advisory
- https://usn.ubuntu.com/3593-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-18206
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/errata/RHSA-2018:1932 | vendor-advisoryx_refsource_REDHATThird Party Advisory | |
| https://access.redhat.com/errata/RHSA-2018:3073 | vendor-advisoryx_refsource_REDHATThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2017-18206 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1549861 | Issue Tracking | |
| https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html | mailing-listx_refsource_MLIST | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-18206 | ||
| https://security.gentoo.org/glsa/201805-10 | vendor-advisoryx_refsource_GENTOOThird Party Advisory | |
| https://sourceforge.net/p/zsh/code/ci/c7a9cf465dd620ef48d586026944d9bd7a0d5d6d | x_refsource_MISCPatchThird Party Advisory | |
| https://usn.ubuntu.com/3593-1/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2017-18206 |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Feb 27, 2018
Updated Aug 5, 2024
Reserved Feb 27, 2018
Link CVE-2017-18206
CISA Vulnrichment
Updated n/a