CVE-2021-41497 json
bounter Null pointer reference
published 2021-12-17 4 y ago modified 2026-06-17 4 mo ago also GHSA-74xw-gwfm-7pv7 , PYSEC-2021-880 , EUVD-2021-0472
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 65%
- public exploits
- 0
- none known
Summary
Null pointer reference in CMS_Conservative_increment_obj in RaRe-Technologies bounter version 1.01 and 1.10, allows attackers to conduct Denial of Service attacks by inputting a huge width of hash bucket.
Exploit prediction
1.07% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/RaRe-Technologies/bounter/issues/47 referenced PoC, tagged "exploit" by a source, unverified
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 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | bounter | <=1.2.0 |
no fix listed |
Classification
- Weakness
-
- CWE-476 NULL Pointer Dereference
References
-
github.com
/RaRe-Technologies/bounter/issues/47
web, exploit, issue-tracking, third-party-advisory, evidence, report
-
nvd.nist.gov
/vuln/detail/CVE-2021-41497
advisory
-
github.com
/RaRe-Technologies/bounter
package
-
github.com
/pypa/advisory-database/tree/main/vulns/bounter/PYSEC-2021-880.yaml
web
-
github.com
/advisories/GHSA-74xw-gwfm-7pv7
advisory
Sources
- CVE List CVE-2021-41497
- GitHub Advisory GHSA-74xw-gwfm-7pv7
- NVD CVE-2021-41497
- OSV PYSEC-2021-880
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.