CVE-2023-27533

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2023-03-30. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
—
EPSS
78.6%
KEV
Not listed

Published

March 30, 2023

Last Modified

February 13, 2026

References (10)

Vendor Advisories for CVE-2023-27533(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntucurl (7.85.0-1ubuntu0.5) @ kinetic2026-05-25ubuntu
ubuntucurl (7.47.0-1ubuntu2.19+esm8) @ xenial2026-05-25ubuntu
redhatcurl-0:7.76.1-26.el92023-11-07redhat
redhatjbcs-httpd24-curl2023-06-05redhat
redhatjbcs-httpd24-curl-0:8.0.1-1.el7jbcs2023-06-05redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(5)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 14× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 106 total refreshes for this CVE.

  1. 2026-07-22 23:08 UTCEG score recompute
  2. 2026-07-22 14:06 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-27533?
CVE-2023-27533 is a high vulnerability published on March 30, 2023. 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…
When was CVE-2023-27533 disclosed?
CVE-2023-27533 was first published in the National Vulnerability Database on March 30, 2023, with the most recent update on February 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-27533 actively exploited?
CVE-2023-27533 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 78.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-27533?
CVE-2023-27533 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2023-27533?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-27533, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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