CVE-2022-23990

Expat (aka libexpat) before 2.4.4 has an integer overflow in the doProlog function.

Published: 2022-01-26 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-23990 is rated Moderate Risk (61.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.96%). 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-2022-23990

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 3.70% 3.96% +0.26%
2 2026-05-26 3.80% 3.70% -0.10%
3 2026-05-22 — 3.80% —

Full EPSS history (52 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-23990

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 134c704f-9b21-4f2e-91b3-4a467353bcc0
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2022-23990

OS Trackers for CVE-2022-23990

vendor priority summary link
alpine — CVE-2022-23990: 1 source package rows (expat); 8 state rows across 8 repos (3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 8, open 0. https://security.alpinelinux.org/vuln/CVE-2022-23990
debian not yet assigned CVE-2022-23990 not yet assigned priority: Debian including 2 source packages (expat, libxmltok), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5, open 2. https://security-tracker.debian.org/tracker/CVE-2022-23990
gentoo high CVE-2022-23990: 1 GLSA(s) (202209-24), 1 atom(s) (dev-libs/expat); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-23990
redhat medium — https://access.redhat.com/security/cve/CVE-2022-23990
suse high CVE-2022-23990 severity important: SUSE including 311 source package names (0.9.0-rev1.1.0-build3.2.14:libexpat1-2.2.5-3.12.1, 1.1.1.0.1.5.568:libexpat1-2.2.5-3.12.1, …), 554 product×package rows across 146 product lines (Container bci/bci-init, Container bci/golang, … (146 product lines)): Fixed 375, Known Affected 175, Known Not Affected 4. https://www.suse.com/security/cve/CVE-2022-23990/
ubuntu medium CVE-2022-23990 medium priority: Ubuntu including 24 source packages (apache2, apr-util, …), 337 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 126, DNE 87, ignored 55, needs-triage 39, released 21, needed 9. https://ubuntu.com/security/CVE-2022-23990

Affected software / configurations for CVE-2022-23990

Vendor Product Version Raw CPE
libexpat_project libexpat < 2.4.4 cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
tenable nessus < 8.15.3 cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:*
tenable nessus >= 10.0.0, < 10.1.1 cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:*
oracle communications_metasolv_solution 6.3.1 cpe:2.3:a:oracle:communications_metasolv_solution:6.3.1:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
fedoraproject fedora 34 cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
fedoraproject fedora 35 cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
siemens sinema_remote_connect_server < 3.1 cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:*

References for CVE-2022-23990

cvelogic Threat Intelligence