Is CVE-2021-22898 in the CISA KEV catalog?

No. CVE-2021-22898 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22898?

CVE-2021-22898 has a CVSS v3 base score of 3.1 (LOW).

What is the EPSS score for CVE-2021-22898?

CVE-2021-22898 has an EPSS score of 4.38% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22898?

Upgrade curl on debian 11 to 7.74.0-1.3+deb11u2 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2021-22898

LOWEPSS 90th pctl

3.1

CVSS v3

NVD

Description

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.

CWE-200Information Exposure CWE-909

How to fix

Remediation Available

curlDebian

Fixed in:7.74.0-1.3+deb11u2CVE-2021-22898

Fixed in:7.79.1-1CVE-2021-22898

curlUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm14USN-5894-1

Fixed in:7.47.0-1ubuntu2.19+esm3USN-5021-2

Fixed in:7.47.0-1ubuntu2.19+esm7USN-5894-1

Fixed in:7.58.0-2ubuntu3.14USN-5021-1

Fixed in:7.68.0-1ubuntu2.6USN-5021-1

libcurl3Ubuntu

Fixed in:7.35.0-1ubuntu2.20+esm14USN-5894-1

Fixed in:7.47.0-1ubuntu2.19+esm7USN-5894-1

Fixed in:7.47.0-1ubuntu2.19+esm3USN-5021-2

libcurl3-gnutlsUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm14USN-5894-1

Fixed in:7.47.0-1ubuntu2.19+esm3USN-5021-2

Fixed in:7.47.0-1ubuntu2.19+esm7USN-5894-1

Fixed in:7.58.0-2ubuntu3.14USN-5021-1

Fixed in:7.68.0-1ubuntu2.6USN-5021-1

libcurl3-nssUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm14USN-5894-1

Fixed in:7.47.0-1ubuntu2.19+esm7USN-5894-1

Fixed in:7.47.0-1ubuntu2.19+esm3USN-5021-2

Fixed in:7.58.0-2ubuntu3.14USN-5021-1

Fixed in:7.68.0-1ubuntu2.6USN-5021-1

libcurl4Ubuntu

Fixed in:7.58.0-2ubuntu3.14USN-5021-1

Fixed in:7.68.0-1ubuntu2.6USN-5021-1

UniversalForwarderWindows application

Affected:8.2.0 8.2.12Fixed in:8.2.12Splunk, Inc.

Affected:9.0.0 9.0.6Fixed in:9.0.6Splunk, Inc.

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

4.38%probability of exploitation in 30 days

90thpercentile

High risk: more likely to be exploited than 90% of all known CVEs.

References

Patch8

Third-Party Advisory6

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-16.