# CVE-2015-20110

## Summary

- **CVE ID:** CVE-2015-20110
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
- **CWE:** N/A
- **Published:** Oct 31, 2023
- **Last Modified:** Sep 17, 2026

## Description

JHipster generator-jhipster before 2.23.0 allows a timing attack against validateToken due to a string comparison that stops at the first character that is different. Attackers can guess tokens by brute forcing one character at a time and observing the timing. This of course drastically reduces the search space to a linear amount of guesses based on the token length times the possible characters.

## Affected Products

- n/a — n/a (n/a)

## References

- [CNA](https://github.com/jhipster/generator-jhipster/issues/2095)
- [CNA](https://github.com/jhipster/generator-jhipster/commit/7c49ab3d45dc4921b831a2ca55fb1e2a2db1ee25)
- [CNA](https://github.com/jhipster/generator-jhipster/commit/79fe5626cb1bb80f9ac86cf46980748e65d2bdbc)
- [CNA](https://github.com/jhipster/generator-jhipster/compare/v2.22.0...v2.23.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 43.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._