01 Record

CVE-2021-29923

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

UnratedPUBLISHEDCNA: mitre

CNA base scoreUnratedNo CNA CVSS vector

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02 Description

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

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 3.74% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 89.4% of scored records. A rank, not a probability.
NVD base score: 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-08-07 16:38Z5 YR AGO

Last updated

2024-08-03 22:18Z2 YR AGO

Reserved

2021-04-01

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

595d0c781fb25bf70acc0c47628459740027f3912e702b24bd7d617972ef3e7b

05 Affected products

VendorProductVersionsPlatforms

fedoraprojectfedoraNot specified—

golanggoNot specified—

oracletimesten_in-memory_databaseNot specified—

redhatadvanced_cluster_securityNot specified—

redhatassisted_installerNot specified—

redhatceph_storageNot specified—

redhatcontainer_native_virtualizationNot specified—

redhatdevtoolsNot specified—

redhatenterprise_linuxNot specified—

redhatopenshiftNot specified—

redhatopenshift_container_storageNot specified—

redhatopenshift_data_foundationNot specified—

redhatopenshift_distributed_tracingNot specified—

redhatopenshift_sandboxed_containersNot specified—

redhatopenstackNot specified—

redhatquayNot specified—

redhatrhmtNot specified—

redhatserverlessNot specified—

redhatservice_meshNot specified—

redhatstfNot specified—

redhatstorageNot specified—

06 References

golang.orghttps://golang.org/pkg/net/#ParseCIDRx_refsource_MISC
www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2022.htmlx_refsource_MISC
defcon.orghttps://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudisx_refsource_MISC
github.comhttps://github.com/golang/go/issues/43389x_refsource_MISC
github.comhttps://github.com/golang/go/issues/30999x_refsource_MISC
go-review.googlesource.comhttps://go-review.googlesource.com/c/go/+/325829/x_refsource_MISC
github.comhttps://github.com/sickcodes/security/blob/master/advisories/SICK-2021-016.mdx_refsource_MISC
lists.fedoraproject.orgFEDORA-2022-17d004ed71https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4CHKSFMHZVOBCZSSVRE3UEYNKARTBMTM/vendor-advisoryx_refsource_FEDORA
security.gentoo.orgGLSA-202208-02https://security.gentoo.org/glsa/202208-02vendor-advisoryx_refsource_GENTOO

07 Fixed in

Arch Linux

go
Fixed in 2:1.17-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

Debian 11

golang-1.15
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.