Vulnerability Details : CVE-2021-41099

Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the underlying string library can be used to corrupt the heap and potentially result with denial of service or remote code execution. The vulnerability involves changing the default proto-max-bulk-len configuration parameter to a very large value and constructing specially crafted network payloads or commands. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the proto-max-bulk-len configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.
Published 2021-10-04 18:15:09
Updated 2022-10-29 02:48:46
Source GitHub, Inc.
View at NVD,   CVE.org
Vulnerability category: OverflowExecute codeDenial of service

Products affected by CVE-2021-41099

Threat overview for CVE-2021-41099

Top countries where our scanners detected CVE-2021-41099
Top open port discovered on systems with this issue 6379
IPs affected by CVE-2021-41099 40,059
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2021-41099!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-41099

EPSS FAQ
0.88%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 83 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-41099

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.0
 MEDIUM AV:N/AC:M/Au:S/C:P/I:P/A:P
6.8
6.4
 NIST
7.5
 HIGH CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
1.6
5.9
 NIST
7.5
 HIGH CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
1.6
5.9
 GitHub, Inc.

CWE ids for CVE-2021-41099

  • The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
    Assigned by:
    • nvd@nist.gov (Secondary)
    • security-advisories@github.com (Primary)
  • The product performs a calculation to determine how much memory to allocate, but an integer overflow can occur that causes less memory to be allocated than expected, leading to a buffer overflow.
    Assigned by: security-advisories@github.com (Primary)

References for CVE-2021-41099

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