CVE-2020-8622
A truncated TSIG response can lead to an assertion failure
- Published
- Updated
- Reserved
- Assigned by
- isc
Description
In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| iscCNA (assigner) | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 5.9% · top 6.7% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Weakness
- Attempting to verify a truncated response to a TSIG-signed request leads to an assertion failure. Affects BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition
- CWE-617 (opens in a new tab)All about CWE-617 and its CVEs
Affected products
What to do
Solution: Upgrade to the patched release most closely related to your current version of BIND: BIND 9.11.22 BIND 9.16.6 BIND 9.17.4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. BIND 9.11.22-S1
Workaround: No workarounds known.
Exploitation: We are not aware of any active exploits
References (13)
- https://kb.isc.org/docs/cve-2020-8622 (opens in a new tab)x_refsource_CONFIRMx_transferred
- FEDORA-2020-a02b7a0f21 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- USN-4468-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-4468-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- DSA-4752 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- FEDORA-2020-14c194e5af (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- [debian-lts-announce] 20200829 [SECURITY] [DLA 2355-1] bind9 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- GLSA-202008-19 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- openSUSE-SU-2020:1699 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- openSUSE-SU-2020:1701 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- https://www.oracle.com/security-alerts/cpuoct2021.html (opens in a new tab)x_refsource_MISCx_transferred
- https://security.netapp.com/advisory/ntap-20200827-0003/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.synology.com/security/advisory/Synology_SA_20_19 (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-8622)Record last updated .