CVE-2021-3842: debian debian_linux
CVSS: 7.5v3.0HighModified
AliasesGHSA-rqjh-jp2r-59cjPYSEC-2022-5UBUNTU-CVE-2021-3842DEBIAN-CVE-2021-3842
Published 04-01-2022Last modified 03-08-2024
Vulnerability summary
CVE-2021-3842 is a high (CVSS 7.5) vulnerability in debian debian_linux. EPSS estimates a 1.46% chance of exploitation in the next 30 days, higher than 73.2% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.0 (CVE.org)EPSS score
1.46%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 04-01-2022PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
nltk is vulnerable to Inefficient Regular Expression Complexity
CVSS metrics
9 scores · 5 sources · 4 versionsHigh 8.7Preferred score · OSV · Pypi (Ecosystem advisory) · calculated from vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NSourcesSingle source
High 7.5Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
High 7.5Preferred score · CVE.org (CNA)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- OSV · PypiEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.46%
Chance of exploitation in the next 30 days
Percentile
73%
Versus all other CVEs
30-day change
0.00 pp
From 1.46% on 19-09-2026
19-09-202619-10-2026
EPSS score1.46%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (huntr.dev)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian2 products
- nltk< 3.6.7-1
- debian_linuxEOL9.0 | 10.0 | 11.0
Fedoraproject1 product
- fedoraEOL35
PyPI1 product
- nltk< 2a50a3edc9d35f57ae42a921c621edc160877f4d | < 3.6.6
Ubuntu1 product
- nltk< 2.0~b9-0ubuntu4.1~esm4 | < 3.1-1ubuntu0.1+esm2 | < 3.2.5-1ubuntu0.1+esm2 | < 3.4.5-2ubuntu0.1~esm2
5 vendors · 7 products
References
12 links- huntr.dev/bounties/761a761e-2be2-430a-8d92-6f74ffe9866aX Refsource CONFIRMWEBExploitIssue TrackingPatchThird Party Advisory
- github.com/nltk/nltk/commit/2a50a3edc9d35f57ae42a921c621edc160877f4dX Refsource MISCWEBFIXREPORTPatchThird Party Advisory
- github.com/nltk/nltkPACKAGE
