bind: Lookups involving a DNAME could trigger an assertion failure when 'synth-from-dnssec' was enabled (which is the default)
Published Mar 23, 2022
7.5
HIGHCVSS 3.1
EPSS 1.35%
Description
Versions affected: BIND 9.18.0 When a vulnerable version of named receives a series of specific queries, the named process will eventually terminate due to a failed assertion check.
Affected products
-
- Version Open Source Branch 9.18 9.18.0StatusaffectedConstraints-
- Version
Configuration 2
- n/a
Configuration 3
- n/a
Configuration 4
- n/a
Configuration 5
- n/a
Configuration 6
- n/a
Configuration 7
- n/a
Configuration 8
- n/a
Configuration 9
- n/a
No data.
Red Hat Enterprise Linux 6
bind
Not affected
Red Hat Enterprise Linux 7
bind
Not affected
Red Hat Enterprise Linux 8
bind
Not affected
Red Hat Enterprise Linux 8
bind9.16
Not affected
Red Hat Enterprise Linux 9
bind
Not affected
Red Hat Enterprise Linux 9
dhcp
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | bind | Not affected | n/a |
| Red Hat Enterprise Linux 7 | bind | Not affected | n/a |
| Red Hat Enterprise Linux 8 | bind | Not affected | n/a |
| Red Hat Enterprise Linux 8 | bind9.16 | Not affected | n/a |
| Red Hat Enterprise Linux 9 | bind | Not affected | n/a |
| Red Hat Enterprise Linux 9 | dhcp | Not affected | n/a |
No package ranges for this CVE.
Remediation
Vendor solution
Users of BIND 9.18.0 should upgrade to BIND 9.18.1
Red Hat statement
The vulnerability affects BIND resolvers running 9.18.0 with both dnssec-validation and synth-from-dnssec enabled. (Note that dnssec-validation auto; is the default setting unless configured otherwise in named.conf and that enabling dnssec-validation automatically enables synth-from-dnssec unless explicitly disabled) This flaw only affects BIND-9.18.0, whereas Red Hat ships BIND-9.16 and lower versions. Therefore, versions of BIND shipped with Red Hat Products are not affected by this flaw.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.35% (0.01348) | 70.44th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.29% (0.01285) | 66.25th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.11% (0.00108) | 26.57th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.11% (0.00112) | 46.37th | v3 (v2023.03.01) |
| Jul 10, 2024 | 0.10% (0.00097) | 41.04th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.09% (0.00094) | 39.01th | v3 (v2023.03.01) |
| Apr 25, 2023 | 0.08% (0.00085) | 34.60th | v3 (v2023.03.01) |
| Mar 30, 2023 | 0.07% (0.00075) | 30.56th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00053) | 19.07th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.89% (0.00885) | 26.24th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Mar 24, 2022 | 0.89% (0.00885) | 11.49th | v2 (v2022.01.01) |
References (7)
- https://access.redhat.com/security/cve/CVE-2022-0635 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2064514 Issue Tracking
- https://kb.isc.org/docs/cve-2022-0635
- https://kb.isc.org/v1/docs/cve-2022-0635 x_refsource_CONFIRMMitigationVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2022-0635
- https://security.netapp.com/advisory/ntap-20220408-0001/ x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2022-0635
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2022-0635 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2064514 | Issue Tracking | |
| https://kb.isc.org/docs/cve-2022-0635 | ||
| https://kb.isc.org/v1/docs/cve-2022-0635 | x_refsource_CONFIRMMitigationVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2022-0635 | ||
| https://security.netapp.com/advisory/ntap-20220408-0001/ | x_refsource_CONFIRMThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2022-0635 |
Change history (0)
No recorded changes yet.