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Fencer Vulns
high 7.5

CVE-2021-43174 json

gzip transfer encoding caused out-of-memory crash

published 2021-11-09 4 y ago modified 2026-06-17 4 mo ago also GHSA-6mv9-qcx2-3hh3 , EUVD-2021-2309

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

NLnet Labs Routinator versions 0.9.0 up to and including 0.10.1, support the gzip transfer encoding when querying RRDP repositories. This encoding can be used by an RRDP repository to cause an out-of-memory crash in these versions of Routinator. RRDP uses XML which allows arbitrary amounts of white space in the encoded data. The gzip scheme compresses such white space extremely well, leading to very small compressed files that become huge when being decompressed for further processing, big enough that Routinator runs out of memory when parsing input data waiting for the next XML element.

Patch / fix

  • crates.io routinator 0.10.2
  • nlnetlabs routinator 0.10.2
  • cfrpki Debian 12 1.4.0-1

debian advisories DEBIAN-CVE-2021-43174

Exploit prediction

1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
crates.io routinator
>=0.9.0, <0.10.2
0.10.2

Affected products

  • NLnet Labs Routinator

Classification

Weakness
  • CWE-1325 Improperly Controlled Sequential Memory Allocation
  • CWE-787 Out-of-bounds Write

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.