Is CVE-2021-22876 in the CISA KEV catalog?

No. CVE-2021-22876 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22876?

CVE-2021-22876 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-22876?

CVE-2021-22876 has an EPSS score of 5.30% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22876?

Upgrade curl on debian 11 to 7.74.0-1.2 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2021-22876

MEDIUMEPSS 92th pctl

5.3

CVSS v3

NVD

Description

curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.

CWE-359 CWE-200Information Exposure

How to fix

Remediation Available

curlDebian

Fixed in:7.74.0-1.2CVE-2021-22876

curlUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm7USN-4903-1

Fixed in:7.47.0-1ubuntu2.19USN-4898-1

Fixed in:7.58.0-2ubuntu3.13USN-4898-1

Fixed in:7.68.0-1ubuntu2.5USN-4898-1

libcurl3Ubuntu

Fixed in:7.35.0-1ubuntu2.20+esm7USN-4903-1

Fixed in:7.47.0-1ubuntu2.19USN-4898-1

libcurl3-gnutlsUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm7USN-4903-1

Fixed in:7.47.0-1ubuntu2.19USN-4898-1

Fixed in:7.58.0-2ubuntu3.13USN-4898-1

Fixed in:7.68.0-1ubuntu2.5USN-4898-1

libcurl3-nssUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm7USN-4903-1

Fixed in:7.47.0-1ubuntu2.19USN-4898-1

Fixed in:7.58.0-2ubuntu3.13USN-4898-1

Fixed in:7.68.0-1ubuntu2.5USN-4898-1

libcurl4Ubuntu

Fixed in:7.58.0-2ubuntu3.13USN-4898-1

Fixed in:7.68.0-1ubuntu2.5USN-4898-1

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.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

5.30%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch3

Third-Party Advisory7

Related Vulnerabilities

Other CWE-359 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-50719	High	7.5	84%	-	Fix
CVE-2022-0482	Critical	9.1	38%	-	Fix
CVE-2023-36052	High	8.6	22%	-	Fix
CVE-2024-45591	Medium	5.3	3.4%	-	Fix
CVE-2022-24819	Medium	5.3	3.3%	-	Fix
CVE-2026-28950	Medium	6.2	2.9%	-	Fix

Embed a live status badge for CVE-2021-22876

Markdown

[![CVE-2021-22876](https://tridentstack.com/cve/badge/CVE-2021-22876.svg)](https://tridentstack.com/cve/CVE-2021-22876)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-22876"><img src="https://tridentstack.com/cve/badge/CVE-2021-22876.svg" alt="CVE-2021-22876"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

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 2025-06-09.