PatchTheCVECVE-2021-29060: A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in Color-String version 1.5.5 and
CVE-2021-29060 is a medium-severity flaw (CVSS 5.3) affecting color-string. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in Color-String version 1.5.5 and below which occurs when the application is provided and checks a crafted invalid HWB string.
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 3.1% (top 12%) |
| CISA exploited list | No |
| Weakness | CWE-770 |
| Published | 2021-06-21 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-29060?
color-string: upgrade to 1.5.5. Exact commands for each OS are on this page.
Is CVE-2021-29060 being exploited?
CVE-2021-29060 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-29060 affect?
CVE-2021-29060 affects color-string. Severity is medium (CVSS 5.3). A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in Color-String version 1.5.5 and below which occurs when the application is provided and checks a crafted invalid HWB string.
How urgent is CVE-2021-29060?
Priority 51/100. Public exploit reference; Remotely exploitable, no login, no user action