An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
4.3.5-3ubuntu24.3.5-3ubuntu34.3.5-3ubuntu44.3.5-3ubuntu54.3.5-3ubuntu64.3.5-3ubuntu74.3.5-3ubuntu7.14.3.5-3ubuntu7.24.3.5-3ubuntu7.34.3.5-3ubuntu7.41:9.11.16+dfsg-3~build11:9.11.16+dfsg-3~ubuntu11:9.18.39-0ubuntu0.22.04.41:9.11.19+dfsg-2.1ubuntu11:9.11.19+dfsg-2.1ubuntu21:9.11.19+dfsg-2.1ubuntu31:9.18.39-0ubuntu0.24.04.54.4.3-P1-2ubuntu54.4.3-P1-4ubuntu14.4.3-P1-4ubuntu21:9.20.11-1ubuntu2.44.4.3-P1-4ubuntu21:9.20.18-1ubuntu2.11:9.9.3.dfsg.P2-4ubuntu11:9.9.3.dfsg.P2-4ubuntu21:9.9.3.dfsg.P2-4ubuntu31:9.9.5.dfsg-21:9.9.5.dfsg-31:9.9.5.dfsg-3ubuntu0.11:9.9.5.dfsg-3ubuntu0.101:9.9.5.dfsg-3ubuntu0.111:9.9.5.dfsg-3ubuntu0.121:9.9.5.dfsg-3ubuntu0.13+26 moreExploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:NI:NA:LCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L