CVE•Published 2023-03-30•Modified 2026-10-14•1 article on news•6 live references•NVD data
CVE-2023-27533Haxx · Curl
Vulnerability data via NVD (ingested)
CVSS v3.1
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS percentile
80
Exploit Prediction Scoring System · top 20% of all CVEs
Weaknesses (CWE)
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.
Timeline
Published 2023-03-30
Modified 2026-10-14
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2023-27533Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Haxx Curl"All exposed Haxx Curl instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Curl"HTTP body or banner mentions "Curl" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2023-27533Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2023-27533Censys host search filtered to this CVE id.
grep.app
CVE-2023-27533Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2023-27533GitHub code search for direct mentions.
Google dork
"CVE-2023-27533" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (2)
CVE-2023-275332 repos