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CVE-2021-43174

25
FAUCET Score

CVE-2021-43174 is a denial-of-service vulnerability affecting NLnet Labs Routinator versions 0.9.0 through 0.10.1. An attacker can exploit the gzip transfer encoding support in RRDP queries to cause an out-of-memory crash. This unauthenticated, low-complexity attack has a high severity CVSS score of 7.5, leading to a complete loss of availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.9.0, < 0.10.2CPE matchmatch criteria
cpe:2.3:a:nlnetlabs:routinator:*:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
<= 0.10.1CPE match
cpe:2.3:a:nlnetlabs:routinator:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.17%
Probability of exploitation in next 30 days
EPSS Percentile
64.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0117 is in the 43rd percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: routinatorFixed in: 0.10.2

Vendor Advisories (1)

rustGHSA-6mv9-qcx2-3hh3high

Memory exhaustion in routinator

Nov 11, 2021

References

debian.org / security/2022/dsa-5041
Third Party Advisory
nlnetlabs.nl / downloads/routinator/CVE-2021-43172_CVE-2021-43173_CVE-2021-43174.txt
Vendor Advisory