vulnwire
5.3med

CVE-2021-25219

Lame cache can be abused to severely degrade resolver performance

Published 5 y ago · modified 4 mo ago · JSON

CVSS
5.3
v3.1 · CNA
CISA KEV
No
not known exploited
EPSS
11.2%
percentile 96%
Public exploits
0
none known

In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.

Exploit prediction (EPSS)

11.16% probability of exploitation in the next 30 days, higher than 96% of all scored CVEs.

CVSS scores

Assigned byVersionScoreVector
CNA3.15.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA3.15.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD3.15.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD2.05.0AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • ISC BIND9

References

  • kb.isc.org /v1/docs/cve-2021-25219 · x_transferred
  • debian.org /security/2021/dsa-4994 · vendor-advisory, x_transferred
  • lists.debian.org /debian-lts-announce/2021/11/msg00001.html · mailing-list, x_transferred
  • lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/YTKC4E3HUOLYN5IA4EBL4VAQ · vendor-advisory, x_transferred
  • lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/YGV7SA27CTYLGFJSPUM3V36Z · vendor-advisory, x_transferred
  • lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/EF4NAVRV4H3W4GA3LGGZYUKD · vendor-advisory, x_transferred
  • oracle.com /security-alerts/cpuapr2022.html · x_transferred
  • cert-portal.siemens.com /productcert/pdf/ssa-389290.pdf · x_transferred
  • security.netapp.com /advisory/ntap-20211118-0002/ · x_transferred
  • security.gentoo.org /glsa/202210-25 · vendor-advisory, x_transferred

Sources

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