HOME VULNERABILITIESCVE-2021-29922

CRITICAL

CVE-2021-29922

NVD-CWE-noinfoPublished: August 7, 2021· Updated: Jun 17, 2026

9.1

CVSS v3.1

Official Description

library/std/src/net/parser.rs in Rust before 1.53.0 does not properly consider extraneous zero characters at the beginning of an IP address string, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation.

Technical Analysis

CVE-2021-29922 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.1.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

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

Affected Vendors & Products

rust-lang1 product(s)

rust

Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/rust-lang/rust/issues/83648

PATCHhttps://github.com/rust-lang/rust/pull/83652

PATCHhttps://github.com/rust-lang/rust/issues/83648

PATCHhttps://github.com/rust-lang/rust/pull/83652

ADVISORYhttps://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudis

ADVISORYhttps://doc.rust-lang.org/beta/std/net/struct.Ipv4Addr.html

ADVISORYhttps://github.com/sickcodes/security/blob/master/advisories/SICK-2021-015.md

ADVISORYhttps://security.gentoo.org/glsa/202210-09

ADVISORYhttps://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudis

ADVISORYhttps://doc.rust-lang.org/beta/std/net/struct.Ipv4Addr.html

ADVISORYhttps://github.com/sickcodes/security/blob/master/advisories/SICK-2021-015.md

ADVISORYhttps://security.gentoo.org/glsa/202210-09

All References (12)

→

https://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudisThird Party Advisory

→

https://doc.rust-lang.org/beta/std/net/struct.Ipv4Addr.htmlVendor Advisory

→

https://github.com/rust-lang/rust/issues/83648Exploit · Issue Tracking · Patch · Third Party Advisory

→

https://github.com/rust-lang/rust/pull/83652Patch · Third Party Advisory

→

https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-015.mdExploit · Third Party Advisory

→

https://security.gentoo.org/glsa/202210-09Third Party Advisory

→

https://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudisThird Party Advisory

→

https://doc.rust-lang.org/beta/std/net/struct.Ipv4Addr.htmlVendor Advisory

→

https://github.com/rust-lang/rust/issues/83648Exploit · Issue Tracking · Patch · Third Party Advisory

→

https://github.com/rust-lang/rust/pull/83652Patch · Third Party Advisory

→

https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-015.mdExploit · Third Party Advisory

→

https://security.gentoo.org/glsa/202210-09Third Party Advisory

Quick Facts

CVE IDCVE-2021-29922

CVSS Score9.1 / 10

SeverityCRITICAL

WeaknessNVD-CWE-noinfo

CISA KEVNo

Affected1 vendor(s)

PublishedAug 7, 2021

Related CVEs (NVD-CWE-noinfo)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2021-29922 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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