8.1

CVE-2017-18205: zsh_project zsh NULL Pointer Dereference

CVSS: 8.1v3.0HighModified
AliasesUBUNTU-CVE-2017-18205DEBIAN-CVE-2017-18205
Published 27-02-2018Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2017-18205 is a high (CVSS 8.1) NULL Pointer Dereference vulnerability in zsh_project zsh. EPSS estimates a 2.04% chance of exploitation in the next 30 days, higher than 80.9% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.0 (NVD)
EPSS score
2.04%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 3
MGASA-2018-0168RHSA-2018:3073SUSE-SU-2018:1072-1SUSE-SU-2022:14910-1USN-3593-1

Timeline

  1. 27-02-2018
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

In builtin.c in zsh before 5.4, when sh compatibility mode is used, there is a NULL pointer dereference during processing of the cd command with no argument if HOME is not set.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

2.04%

Chance of exploitation in the next 30 days

Percentile

81%

Versus all other CVEs

30-day change

+0.13 pp

From 1.91% on 21-09-2026

21-09-202621-10-2026
EPSS score
2.04%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • zsh< 5.4.1-1
Ubuntu1 product
  • zsh< 5.0.2-3ubuntu6.1 | < 5.1.1-1ubuntu2.1
Zsh_project1 product

3 vendors · 3 products

References

8 links