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CVE-2021-3761

HIGH
Published 2021-09-09T14:05:09.349774Z
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CVSS Score

V3.1
7.5
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.005
probability
of exploitation in the wild

There is a 0.4% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.626
Higher than 62.6% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Description

Any CA issuer in the RPKI can trick OctoRPKI prior to 1.3.0 into emitting an invalid VRP "MaxLength" value, causing RTR sessions to terminate. An attacker can use this to disable RPKI Origin Validation in a victim network (for example AS 13335 - Cloudflare) prior to launching a BGP hijack which during normal operations would be rejected as "RPKI invalid". Additionally, in certain deployments RTR session flapping in and of itself also could cause BGP routing churn, causing availability issues.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Cloudflare

octorpki

Affected Versions:

unspecified

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed HIGH

OctoRPKI lacks contextual out-of-bounds check when validating RPKI ROA maxLength values

GHSA-c8xp-8mf3-62h9

Advisory Details

Any CA issuer in the RPKI can trick OctoRPKI prior to https://github.com/cloudflare/cfrpki/commit/a8db4e009ef217484598ba1fd1c595b54e0f6422 into emitting an invalid VRP "MaxLength" value, causing RTR sessions to terminate. ### Impact An attacker can use this to disable RPKI Origin Validation in a victim network (for example AS 13335 - Cloudflare) prior to launching a BGP hijack which during normal operations would be rejected as "RPKI invalid". Additionally, in certain deployments RTR session flapping in and of itself also could cause BGP routing churn, causing availability issues. ### Patches https://github.com/cloudflare/cfrpki/commit/a8db4e009ef217484598ba1fd1c595b54e0f6422 https://github.com/cloudflare/cfrpki/releases/tag/v1.3.0 ### For more information If you have any questions or comments about this advisory: * Email us at [[email protected]]([email protected])

Affected Packages

Go github.com/cloudflare/cfrpki
ECOSYSTEM: ≥0 <1.3.0

CVSS Scoring

CVSS Score

7.5

CVSS Vector

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

References

WEB https://github.com/cloudflare/cfrpki/security/advisories/GHSA-c8xp-8mf3-62h9
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-3761
WEB https://github.com/cloudflare/cfrpki/pull/90
WEB https://github.com/cloudflare/cfrpki/commit/a8db4e009ef217484598ba1fd1c595b54e0f6422
WEB https://github.com/cloudflare/cfrpki/releases/tag/v1.3.0
WEB https://pkg.go.dev/vuln/GO-2022-0246
WEB https://www.debian.org/security/2022/dsa-5041
PACKAGE github.com/cloudflare/cfrpki

Advisory provided by GitHub Security Advisory Database. Published: September 7, 2021, Modified: September 3, 2021

References

https://github.com/cloudflare/cfrpki/security/advisories/GHSA-c8xp-8mf3-62h9
https://www.debian.org/security/2022/dsa-5041
Published: 2021-09-09T14:05:09.349774Z
Last Modified: 2024-09-17T02:56:31.062Z
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