7.5

CVE-2021-43173: debian debian_linux

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2021-43173DEBIAN-CVE-2021-43173
Published 09-11-2021Last modified 16-09-2024
Open JSON

Vulnerability summary

CVE-2021-43173 is a high (CVSS 7.5) vulnerability in debian debian_linux. EPSS estimates a 1.49% chance of exploitation in the next 30 days, higher than 73.7% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.49%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2
DSA-5033-1DSA-5041-1

Timeline

  1. 09-11-2021
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

In NLnet Labs Routinator prior to 0.10.2, a validation run can be delayed significantly by an RRDP repository by not answering but slowly drip-feeding bytes to keep the connection alive. This can be used to effectively stall validation. While Routinator has a configurable time-out value for RRDP connections, this time-out was only applied to individual read or write operations rather than the complete request. Thus, if an RRDP repository sends a little bit of data before that time-out expired, it can continuously extend the time it takes for the request to finish. Since validation will only continue once the update of an RRDP repository has concluded, this delay will cause validation to stall, leading to Routinator continuing to serve the old data set or, if in the initial validation run directly after starting, never serve any data at all.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.49%

Chance of exploitation in the next 30 days

Percentile

74%

Versus all other CVEs

30-day change

+0.01 pp

From 1.48% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.49%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian4 products
  • cfrpki< 1.4.0-1
  • fort-validator< 1.5.3-1
  • rpki-client< 7.5-1
  • debian_linuxEOL11.0
Nlnet labs1 product
Nlnetlabs1 product
Ubuntu1 product
  • fort-validatorAll versions (No fix recorded)

4 vendors · 7 products

References

8 links