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Fencer Vulns
high 7.8

CVE-2021-31155 json

Permissions bypass in pleaser

published 2021-05-27 5 y ago modified 2026-06-17 4 mo ago also GHSA-vc5p-j8vw-mc6x , RUSTSEC-2021-0101 , EUVD-2021-1889

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

Failure to normalize the umask in please before 0.4 allows a local attacker to gain full root privileges if they are allowed to execute at least one command.

Patch / fix

  • crates.io pleaser 0.4.0
  • umask_project umask 0.4
  • rust-pleaser Debian 14, Debian 13, Debian 12 0.4.1-1

debian advisories DEBIAN-CVE-2021-31155

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • openwall.com https://www.openwall.com/lists/oss-security/2021/05/18/1 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C
OSV 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
crates.io pleaser
<0.4.0
>=0.0.0-0, <0.4.0
0.4.0

Classification

Weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource
  • CWE-269 Improper Privilege Management
  • CWE-279 Incorrect Execution-Assigned Permissions

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.