CVE-2021-29923

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 4%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
88.8%
KEV
Not listed

Published

August 7, 2021

Last Modified

November 21, 2024

References (18)

Vendor Advisories for CVE-2021-29923(20)

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

Patch Availability(17)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatodf4/volume-replication-rhel8-operator:v4.10.0-112022-04-13redhat
redhatservicemesh-proxy-0:2.0.9-3.el82022-04-07redhat
redhatopenshift4-wincw/windows-machine-config-rhel8-operator:5.0.0-52022-03-28redhat
redhatgolang-qpid-apache-0:0.32.0-rc1.9.el8ost2022-03-24redhat
redhatgolang-github-vbatts-tar-split-0:0.11.1-6.el8ost2022-03-24redhat
redhatignition-0:2.12.0-3.rhaos4.9.el82022-02-23redhat
redhatopenshift4/ovirt-csi-driver-rhel8-operator:v4.9.0-202202120107.p0.g9302429.assembly.stream2022-02-23redhat
redhatadvanced-cluster-security/rhacs-scanner-rhel8:3.68.0-62022-02-03redhat
redhatopenshift-serverless-1-tech-preview/eventing-kafka-broker-webhook-rhel8:0.26.0-22022-02-03redhat
redhatopenshift-serverless-clients-0:0.26.0-2.el82022-02-03redhat
redhatetcd-0:3.3.23-7.el8ost2022-01-25redhat
redhatkubevirt-0:4.8.3-251.el82021-12-02redhat
redhatadvanced-cluster-security/rhacs-rhel8-operator:3.67.0-32021-12-01redhat
redhatcontainer-native-virtualization/kubevirt-cpu-node-labeller:v2.6.8-12021-11-17redhat
redhatkubevirt-0:2.6.8-211.el82021-11-17redhat
redhatgo-toolset:rhel8-8040020210909125047.5081a2622021-09-21redhat
redhatgo-toolset-1.15-golang-0:1.15.14-2.el7_92021-09-07redhat

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.

Additional Vendor Advisories

(4)

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 13× 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 101 total refreshes for this CVE.

  1. 2026-07-22 22:47 UTCEG score recompute
  2. 2026-07-22 14:06 UTCEPSS rescore
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  10. 2026-07-18 14:59 UTCOSV refresh
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  1. 2026-07-07 13:43 UTCEPSS rescore
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  11. 2026-06-30 23:20 UTCEPSS rescore
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  41. 2026-06-13 00:44 UTCOSV refresh
  42. 2026-06-12 23:10 UTCEPSS rescore
  43. 2026-06-11 13:58 UTCEPSS rescore
  44. 2026-06-10 22:16 UTCEPSS rescore
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  46. 2026-06-08 14:15 UTCEPSS rescore
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  72. 2026-05-26 12:29 UTCEG score recompute
  73. 2026-05-26 12:29 UTCVendor advisory
  74. 2026-05-26 12:29 UTCGHSA enrichment
  75. 2026-05-26 07:17 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-29923?
CVE-2021-29923 is a high vulnerability published on August 7, 2021. Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.
When was CVE-2021-29923 disclosed?
CVE-2021-29923 was first published in the National Vulnerability Database on August 7, 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-2021-29923 actively exploited?
CVE-2021-29923 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 88.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-29923?
CVE-2021-29923 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2021-29923?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-29923, 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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