CVE-2022-22824

defineAttribute in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.

Published: 2022-01-10 Last update: 2025-05-05 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-22824 is rated Moderate Risk (61.3/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.43%). 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-2022-22824

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 2026-05-26 0.32% 0.43% +0.11%
2 2026-05-22 0.43% 0.32% -0.11%
3 2025-12-13 — 0.43% —

Full EPSS history (26 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-22824

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/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:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2022-22824

OS Trackers for CVE-2022-22824

vendor priority summary link
alpine — CVE-2022-22824: 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-2022-22824
debian not yet assigned CVE-2022-22824 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-2022-22824
gentoo high CVE-2022-22824: 1 GLSA(s) (202209-24), 1 atom(s) (dev-libs/expat); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-22824
redhat high — https://access.redhat.com/security/cve/CVE-2022-22824
suse high CVE-2022-22824 severity important: SUSE including 327 source package names (0.1.0:libexpat1-2.2.5-3.9.1, 0.1.75:libexpat1-2.2.5-3.9.1, …), 568 product×package rows across 156 product lines (Container bci/bci-init, Container bci/golang, … (156 product lines)): Fixed 398, Known Affected 166, Known Not Affected 4. https://www.suse.com/security/cve/CVE-2022-22824/
ubuntu medium CVE-2022-22824 medium priority: Ubuntu including 24 source packages (apache2, apr-util, …), 359 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 105, DNE 91, needs-triage 65, ignored 64, released 34. https://ubuntu.com/security/CVE-2022-22824

Affected software / configurations for CVE-2022-22824

Vendor Product Version Raw CPE
libexpat_project libexpat < 2.4.3 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:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
siemens sinema_remote_connect_server < 3.1 cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:*

References for CVE-2022-22824

cvelogic Threat Intelligence