Unbound before 1.3.4 does not properly verify signatures for NSEC3 records, which allows remote attackers to cause secure delegations to be downgraded via DNS spoofing or other DNS-related attacks in conjunction with crafted delegation responses
Published Oct 13, 2009
7.5
HIGHCVSS 2.0
EPSS 2.98%
Description
Unbound before 1.3.4 does not properly verify signatures for NSEC3 records, which allows remote attackers to cause secure delegations to be downgraded via DNS spoofing or other DNS-related attacks in conjunction with crafted delegation responses.
Affected products
No data.
- ≤ 1.3.3
- 0.0
- 0.1
- 0.2
- 0.3
- 0.4
- 0.5
- 0.6
- 0.7
- 0.7.1
- 0.7.2
- 0.8
- 0.09
- 0.10
- 0.11
- 1.0.0
- 1.0.1
- 1.0.2
- 1.1.0
- 1.1.1
- 1.2.0
- 1.2.1
- 1.3.0
- 1.3.1
- 1.3.2
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.98% (0.02976) | 86.79th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.98% (0.02976) | 85.45th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.64% (0.01644) | 80.28th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.83% (0.02828) | 76.94th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.64% (0.01644) | 80.70th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.80% (0.00799) | 82.35th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.80% (0.00799) | 81.08th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.80% (0.00799) | 78.97th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.97% (0.01974) | 78.97th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.97% (0.01974) | 77.12th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.97% (0.01974) | 56.20th | v2 (v2022.01.01) |
References (9)
- http://osvdb.org/58836 vdb-entryx_refsource_OSVDB
- http://secunia.com/advisories/36996 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/37913 third-party-advisoryx_refsource_SECUNIA
- http://unbound.net/pipermail/unbound-users/2009-October/000852.html mailing-listx_refsource_MLISTVendor Advisory
- http://www.debian.org/security/2009/dsa-1963 vendor-advisoryx_refsource_DEBIAN
- http://www.openwall.com/lists/oss-security/2009/10/09/2 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2009/10/09/3 mailing-listx_refsource_MLIST
- http://www.vupen.com/english/advisories/2009/2875 vdb-entryx_refsource_VUPENVendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/53729 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://osvdb.org/58836 | vdb-entryx_refsource_OSVDB | |
| http://secunia.com/advisories/36996 | third-party-advisoryx_refsource_SECUNIAVendor Advisory | |
| http://secunia.com/advisories/37913 | third-party-advisoryx_refsource_SECUNIA | |
| http://unbound.net/pipermail/unbound-users/2009-October/000852.html | mailing-listx_refsource_MLISTVendor Advisory | |
| http://www.debian.org/security/2009/dsa-1963 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.openwall.com/lists/oss-security/2009/10/09/2 | mailing-listx_refsource_MLIST | |
| http://www.openwall.com/lists/oss-security/2009/10/09/3 | mailing-listx_refsource_MLIST | |
| http://www.vupen.com/english/advisories/2009/2875 | vdb-entryx_refsource_VUPENVendor Advisory | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/53729 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.