CVE-2023-27533

Name: CVE-2023-27533
Creator: NVD / NIST
Published: 2023-03-30T20:15:07.373+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.99%

Last modified Jun 17, 2026

CVE-2023-27533 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A vulnerability in input validation exists in curl <8.0 during communication using the TELNET protocol may allow an attacker to pass on maliciously crafted user name and "telnet options" during server negotiation. The lack of proper input scrubbing allows an attacker to send content or perform option negotiation without the application's intent. EPSS estimates a 1.99% chance of exploitation in the next 30 days.

Description

A vulnerability in input validation exists in curl <8.0 during communication using the TELNET protocol may allow an attacker to pass on maliciously crafted user name and "telnet options" during server negotiation. The lack of proper input scrubbing allows an attacker to send content or perform option negotiation without the application's intent. This vulnerability could be exploited if an application allows user input, thereby enabling attackers to execute arbitrary code on the system.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

1.99%

78.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Haxx	Curl	>= 7.0.0, <= 7.881
Fedoraproject	Fedora	36
Netapp	Active Iq Unified Manager	All versions
Netapp	Clustered Data Ontap	9.0
Netapp	H300s Firmware	All versions
Netapp	H500s Firmware	All versions
Netapp	H700s Firmware	All versions
Netapp	H410s Firmware	All versions
Splunk	Universal Forwarder	>= 8.2.0, < 8.2.12
Splunk	Universal Forwarder	>= 9.0.0, < 9.0.6
Splunk	Universal Forwarder	9.1.0

References

https://hackerone.com/reports/1891474Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/04/msg00025.htmlMailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202310-12Third Party Advisory
https://security.netapp.com/advisory/ntap-20230420-0011/Third Party Advisory
https://hackerone.com/reports/1891474Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/04/msg00025.htmlMailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202310-12Third Party Advisory
https://security.netapp.com/advisory/ntap-20230420-0011/Third Party Advisory

Timeline

Published: Mar 30, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-27533?

How severe is CVE-2023-27533?

CVE-2023-27533 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.99% probability of exploitation in the next 30 days.

How do I fix CVE-2023-27533?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-27533?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST