Vulnerability Details : CVE-2023-26438

External service lookups for a number of protocols were vulnerable to a time-of-check/time-of-use (TOCTOU) weakness, involving the JDK DNS cache. Attackers that were timing DNS cache expiry correctly were able to inject configuration that would bypass existing network deny-lists. Attackers could exploit this weakness to discover the existence of restricted network infrastructure and service availability. Improvements were made to include deny-lists not only during the check of the provided connection data, but also during use. No publicly available exploits are known.
Published 2023-08-02 13:15:10
Updated 2024-01-12 08:15:41
Source Open-Xchange
View at NVD,   CVE.org
Vulnerability category: Server-side request forgery (SSRF)

Products affected by CVE-2023-26438

Exploit prediction scoring system (EPSS) score for CVE-2023-26438

EPSS FAQ
0.17%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 55 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-26438

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
3.1
 LOW CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
1.6
1.4
 NIST
4.3
 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
2.8
1.4
 Open-Xchange

CWE ids for CVE-2023-26438

  • The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.
    Assigned by: nvd@nist.gov (Primary)
  • The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
    Assigned by:
    • nvd@nist.gov (Primary)
    • security@open-xchange.com (Secondary)

References for CVE-2023-26438

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