Nltk
CVE-2021-3828
HIGH
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V2 - Validation and Business Logic Regex complexity limits
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system. |
Get an e-mail when this CVE is exploited, patched or re-scored. Free account.
Alert meAnalysisAI
nltk is vulnerable to Inefficient Regular Expression Complexity. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in pypi
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified under CWE-1333. nltk is vulnerable to Inefficient Regular Expression Complexity Affected products include: Nltk.
Know when Nltk gets its next vulnerability
- Watch products and get an email when something new is published
- Check this CVE against your own stack and servers
- Exploit and PoC references, threat intelligence from 22 sources
No credit card · 7-day full trial
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
nltk is vulnerable to Inefficient Regular Expression Complexity
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)NVD
Arbitrary code execution in the Natural Language Toolkit (NLTK) before 3.10.3 allows attackers to bypass the library's p
Arbitrary code execution in NLTK (Natural Language Toolkit) through 3.9.4 allows attackers to run Python code when a vic
Arbitrary code execution in the NLTK (Natural Language Toolkit) Python library affects all versions through its data dow
StreamBackedCorpusView in NLTK before 3.10.0 allows arbitrary local file reads by calling Python's builtins.open() direc
Symlink-based path traversal in NLTK's FramenetCorpusReader before version 3.10.2 permits attackers with write access to
Unbounded recursion in NLTK's JSONTaggedDecoder.decode_obj() (nltk/jsontags.py) allows unauthenticated remote attackers
Path traversal and pickle deserialization protections in NLTK before 3.10.0 are effectively disabled by default - pathse
XML Entity Expansion (Billion Laughs) in NLTK before 3.10.3 allows unauthenticated remote attackers to cause denial of s
Server-side request forgery in NLTK before 3.10.3 allows unauthenticated remote attackers to reach internal HTTP service
Symlink escape in NLTK's CorpusReader.open() allows local attackers to read arbitrary files outside the designated corpu
Path traversal in NLTK's FramenetCorpusReader and NKJPCorpusReader (all versions before 3.10.0) enables unauthenticated
NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research a
Exploit-DB