CVE-2021-33580 json
regex injection leading to DoS
published 2021-08-18 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20266
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.3%
- EPSS 3.3% chance of exploitation in 30 days, percentile 88%
- public exploits
- 0
- none known
Summary
User controlled `request.getHeader("Referer")`, `request.getRequestURL()` and `request.getQueryString()` are used to build and run a regex expression. The attacker doesn't have to use a browser and may send a specially crafted Referer header programmatically. Since the attacker controls the string and the regex pattern he may cause a ReDoS by regex catastrophic backtracking on the server side. This problem has been fixed in Roller 6.0.2.
Patch / fix
- Apache Software Foundation Apache Roller 6.0.2
Exploit prediction
3.30% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:N/A:P |
Affected products
- Apache Software Foundation Apache Roller
Classification
- Weakness
-
- CWE-400 Uncontrolled Resource Consumption
References
-
lists.apache.org
/thread.html/r9d967d80af941717573e531db2c7353a90bfd0886e9b5d5d79f75506%40%3Cuser.roller.apache.org%3E
mailing-list, vendor-advisory
-
openwall.com
/lists/oss-security/2021/08/18/1
mailing-list, third-party-advisory
Sources
- CVE List CVE-2021-33580
- NVD CVE-2021-33580
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