CVE-2021-33194

HIGHNVD 7.57.5—Trending — 3 sources updated this week

7.5

golang.org/x/net before v0.0.0-20210520170846-37e1c6afe023 allows attackers to cause a denial of service (infinite loop) via crafted ParseFragment input.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 34.0%
KEV: Not listed

Published

May 26, 2021

Last Modified

November 21, 2024

References (6)

cve@mitrehttps://github.com/golang/net/commit/37e1c6afe02340126705deced573a85ab75209d7
cve@mitrehttps://groups.google.com/g/golang-announce/c/wPunbCPkWUg
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4CHKSFMHZVOBCZSSVRE3UEYNKARTBMTM/
af854a3a-2127-422b-91ae-364da2661108https://github.com/golang/net/commit/37e1c6afe02340126705deced573a85ab75209d7
af854a3a-2127-422b-91ae-364da2661108https://groups.google.com/g/golang-announce/c/wPunbCPkWUg
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4CHKSFMHZVOBCZSSVRE3UEYNKARTBMTM/

Vendor Advisories for CVE-2021-33194(1)

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

RHSA-2021:2438
Red Hat Product SecurityMedium
Red Hat Security Advisory: OpenShift Container Platform 4.8.2 bug fix and security update

Patch Availability(5)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	golang-golang-x-net-dev (1:0.0+git20160110.4fd4a9f-1ubuntu0.1~esm2) @ xenial	2026-05-26	ubuntu
ubuntu	lxd-tools (3.0.3-0ubuntu1~18.04.2+esm2) @ bionic	2026-05-26	ubuntu
redhat	openshift-logging/elasticsearch-rhel8-operator:v5.3.0-19	2021-11-15	redhat
redhat	openshift4/ose-oauth-proxy:v4.9.0-202109302016.p0.git.9ea1ebc.assembly.stream	2021-10-18	redhat
redhat	openshift4/ose-cluster-node-tuning-operator:v4.8.0-202107091725.p0.git.6be3f67.assembly.stream	2021-07-27	redhat

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.

Affected Packages

(1 across 1 ecosystem)

Go(1)

Package	Vulnerable range	Fixed in	Dependents
golang.org/x/net	—	0.0.0-20210520170846-37e1c6afe023	—

Weakness Classification(1)

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

CWE-835Loop with Unreachable Exit Condition (Infinite Loop)

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 19× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 16:06 UTCEG score recompute
2026-05-26 16:06 UTCVendor advisory
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-33194?

CVE-2021-33194 is a high vulnerability published on May 26, 2021. golang.org/x/net before v0.0.0-20210520170846-37e1c6afe023 allows attackers to cause a denial of service (infinite loop) via crafted ParseFragment input.

When was CVE-2021-33194 disclosed?

CVE-2021-33194 was first published in the National Vulnerability Database on May 26, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-33194 actively exploited?

CVE-2021-33194 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 34.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-33194?

CVE-2021-33194 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-33194?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33194, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-33194

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CVE-2021-33194

Published

Last Modified

References (6)

Vendor Advisories for CVE-2021-33194(1)

Patch Availability(5)

Affected Packages

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-33194?

Same vendor

Same CWE

CVE-2021-33194

📅 Published

🔄 Last Modified

🔗 References (6)

📣 Vendor Advisories for CVE-2021-33194(1)

Patch Availability(5)

Affected Packages

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-33194?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

References (6)

Vendor Advisories for CVE-2021-33194(1)

Frequently asked(5)

Related CVEs(same vendor + same CWE)