CVE-2022-2906 | Memory leaks in code handling Diffie-Hellman key exchange via TKEY RRs (OpenSSL 3.0.0+ only)

An attacker can leverage this flaw to gradually erode available memory to the point where named crashes for lack of resources. Upon restart the attacker would have to begin again, but nevertheless there is the potential to deny service.

Published: 2022-09-21 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-2906 is rated Moderate Risk (56/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.57%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2022-2906

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.86% 1.57% +0.71%
2 2025-12-01 1.00% 0.86% -0.14%
3 2025-11-21 — 1.00% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-2906

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2022-2906

OS Trackers for CVE-2022-2906

vendor priority summary link
alpine — CVE-2022-2906: 1 source package rows (bind); 13 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 7, open 6. https://security.alpinelinux.org/vuln/CVE-2022-2906
debian unimportant CVE-2022-2906 unimportant priority: Debian including 1 source packages (bind9), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2022-2906
gentoo low CVE-2022-2906: 1 GLSA(s) (202210-25), 2 atom(s) (net-dns/bind, net-dns/bind-tools); latest impact low. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-2906
redhat medium — https://access.redhat.com/security/cve/CVE-2022-2906
suse high CVE-2022-2906 severity important: SUSE including 43 source package names (bind, bind-9.18.7-1.1, …), 311 product×package rows across 39 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (39 product lines)): Known Not Affected 294, Fixed 17. https://www.suse.com/security/cve/CVE-2022-2906/
ubuntu medium CVE-2022-2906 medium priority: Ubuntu including 2 source packages (bind9, isc-dhcp), 14 status rows across 7 suites (bionic, focal, jammy, kinetic, trusty, upstream, xenial): not-affected 10, needs-triage 2, released 2. https://ubuntu.com/security/CVE-2022-2906

Affected software / configurations for CVE-2022-2906

Vendor Product Version Raw CPE
isc bind >= 9.18.0, < 9.18.7 cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*
isc bind >= 9.19.0, < 9.19.5 cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*

References for CVE-2022-2906

URL Tags
http://www.openwall.com/lists/oss-security/2022/09/21/3 Mailing List Patch Third Party Advisory
https://kb.isc.org/docs/cve-2022-2906 Patch Vendor Advisory
https://security.gentoo.org/glsa/202210-25 Third Party Advisory
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