CVE-2021-22898

LOWNVD 3.13.1—
EchelonGraph scoreMEDIUM confidence

Score 3.1 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 3.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
3.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 4%CVSS: 3.1Exploit: NoneExposed: 0

A fix is available — apply it.

curl 7.7 through 7.76.1 suffers from an information disclosure when the -t command line option, known as CURLOPT_TELNETOPTIONS in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol.

CVSS v3
3.1
EG Score
3.1(medium)
EPSS
90.2%
KEV
Not listed

Published

June 11, 2021

Last Modified

April 16, 2026

References (28)

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcurl4-openssl-dev (7.47.0-1ubuntu2.19+esm3) @ xenial2026-05-22ubuntu
ubuntucurl (7.74.0-1ubuntu2.1) @ hirsute2026-05-22ubuntu
ubuntucurl (7.47.0-1ubuntu2.19+esm7) @ xenial2026-05-22ubuntu
redhatcurl-0:7.61.1-22.el82021-11-09redhat

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.

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 46× 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 127 total refreshes for this CVE.

  1. 2026-07-21 15:22 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-22898?
CVE-2021-22898 is a low vulnerability published on June 11, 2021. curl 7.7 through 7.76.1 suffers from an information disclosure when the -t command line option, known as CURLOPTTELNETOPTIONS in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEWENV variables, libcurl could be made to pass on…
When was CVE-2021-22898 disclosed?
CVE-2021-22898 was first published in the National Vulnerability Database on June 11, 2021, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-22898 actively exploited?
CVE-2021-22898 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-22898?
CVE-2021-22898 has a CVSS v3 base score of 3.1 (NVD).
How do I remediate CVE-2021-22898?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-22898, 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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