CVE-2024-20505 [Medium] | Out-of-bounds Read in Clamav

A vulnerability in the PDF parsing module of Clam AntiVirus (ClamAV) versions 1.4.0, 1.3.2 and prior versions, all 1.2.x versions, 1.0.6 and prior versions, all 0.105.x versions, all 0.104.x versions, and 0.103.11 and all prior versions could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to an out of bounds read. An attacker could exploit this vulnerability by submitting a crafted PDF file to be scanned by ClamAV on an affected device. An exploit could allow the attacker to terminate the scanning process.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.89%	0.56%	-0.33%
2	2026-04-10	0.80%	0.89%	+0.09%
3	2026-03-27	—	0.80%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.89%

0.56%

-0.33%

2026-04-10

0.80%

0.89%

+0.09%

2026-03-27

—

0.80%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.0	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	2.5	1.4	[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]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.0

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

2.5

1.4

[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]

OS Trackers for CVE-2024-20505

vendor	priority	summary	link
`alpine`	medium	CVE-2024-20505: 1 source package rows (clamav); 7 state rows across 3 repos (3.21-community, 3.22-community, edge-community); fixed 3, open 4.	https://security.alpinelinux.org/vuln/CVE-2024-20505
`debian`	not yet assigned	CVE-2024-20505 not yet assigned priority: Debian including 1 source packages (clamav), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2024-20505
`gentoo`	normal	CVE-2024-20505: 1 GLSA(s) (202507-03), 1 atom(s) (app-antivirus/clamav); latest impact normal.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2024-20505
`suse`	high	CVE-2024-20505 severity important: SUSE including 52 source package names (clamav-0.103.12-150000.3.53.1, clamav-0.103.12-3.33.1, …), 250 product×package rows across 39 product lines (Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production, … (39 product lines)): Fixed 250.	https://www.suse.com/security/cve/CVE-2024-20505/
`ubuntu`	medium	CVE-2024-20505 medium priority: Ubuntu including 1 source packages (clamav), 10 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): released 9, needed 1.	https://ubuntu.com/security/CVE-2024-20505

Affected software / configurations for CVE-2024-20505

Vendor	Product	Version	Raw CPE
clamav	clamav	< 0.103.12	cpe:2.3:a:clamav:clamav::::::::
clamav	clamav	>= 0.104.0, < 1.0.7	cpe:2.3:a:clamav:clamav::::::::
clamav	clamav	>= 1.2.0, < 1.3.2	cpe:2.3:a:clamav:clamav::::::::
clamav	clamav	1.4.0	cpe:2.3:a:clamav:clamav:1.4.0:::::::*

References for CVE-2024-20505

URL	Tags
https://blog.clamav.net/2024/09/clamav-141-132-107-and-010312-security.html	Patch Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/12/msg00004.html

URL

CVE-2024-20505 | ClamAV Memory Handling DoS

Exploit prediction scoring system (EPSS) score for CVE-2024-20505

Common vulnerability scoring system (CVSS) metrics for CVE-2024-20505

Weakness enumeration for CVE-2024-20505

OS Trackers for CVE-2024-20505

Affected software / configurations for CVE-2024-20505

References for CVE-2024-20505