Description
A vulnerability in the email parsing module in Clam AntiVirus (ClamAV) Software version 0.103.1 and all prior versions could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. The vulnerability is due to improper variable initialization that may result in an NULL pointer read. An attacker could exploit this vulnerability by sending a crafted email to an affected device. An exploit could allow the attacker to cause the ClamAV scanning process crash, resulting in a denial of service condition.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Cisco | ClamAV | unspecified – ≤ 0.103.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | clamav | 0.103.2+dfsg-1 | — |
| Debian 13 | clamav | 0.103.2+dfsg-1 | — |
| Debian 12 | clamav | 0.103.2+dfsg-1 | — |
| Debian 9 | clamav | 0.102.4+dfsg-0+deb9u2 | DLA-2626-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | clamav | 0.103.2+dfsg-0ubuntu0.20.04.1 | USN-4918-1 |
| Ubuntu 18.04 LTS | clamav | 0.103.2+dfsg-0ubuntu0.18.04.1 | USN-4918-1 |
| Ubuntu 16.04 LTS | clamav | 0.103.2+dfsg-0ubuntu0.16.04.1 | USN-4918-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | clamav | 0.103.2+dfsg-0ubuntu0.14.04.1+esm1 | USN-4918-2 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | clamav | 0.103.2-3.26.1 | SUSE-SU-2021:1190-1 |
| SLES 15 SP1 | clamav | 0.103.2-3.26.1 | SUSE-SU-2021:1190-1 |
| SLES 15 | clamav | 0.103.2-3.26.1 | SUSE-SU-2021:1190-1 |
| SLES 12 SP5 | clamav | 0.103.2-3.6.1 | SUSE-SU-2021:1174-1 |
| SLES 12 SP4 | clamav | 0.103.2-33.35.1 | SUSE-SU-2021:1189-1 |
Show 20 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | clamav | 0.103.2-33.35.1 | SUSE-SU-2021:1189-1 |
| SLES 12 SP2 | clamav | 0.103.2-33.35.1 | SUSE-SU-2021:1189-1 |
| SLES 11 SP4 | clamav | 0.103.2-0.20.35.1 | SUSE-SU-2021:14692-1 |
| SLES for SAP 15 SP1 | clamav | 0.103.2-3.26.1 | SUSE-SU-2021:1190-1 |
| SLES for SAP 15 | clamav | 0.103.2-3.26.1 | SUSE-SU-2021:1190-1 |
| SLES for SAP 12 SP5 | clamav | 0.103.2-3.6.1 | SUSE-SU-2021:1174-1 |
| SLES for SAP 12 SP4 | clamav | 0.103.2-33.35.1 | SUSE-SU-2021:1189-1 |
| SLES for SAP 12 SP3 | clamav | 0.103.2-33.35.1 | SUSE-SU-2021:1189-1 |
| SLE HPC 15 SP1 | clamav | 0.103.2-3.26.1 | SUSE-SU-2021:1190-1 |
| SLE HPC 15 | clamav | 0.103.2-3.26.1 | SUSE-SU-2021:1190-1 |
| SUSE OpenStack Cloud Crowbar 9 | clamav | 0.103.2-33.35.1 | SUSE-SU-2021:1189-1 |
| SUSE OpenStack Cloud Crowbar 8 | clamav | 0.103.2-33.35.1 | SUSE-SU-2021:1189-1 |
| SUSE OpenStack Cloud 9 | clamav | 0.103.2-33.35.1 | SUSE-SU-2021:1189-1 |
| SUSE OpenStack Cloud 8 | clamav | 0.103.2-33.35.1 | SUSE-SU-2021:1189-1 |
| SUSE Manager Server 4.0 | clamav | 0.103.2-3.26.1 | SUSE-SU-2021:1190-1 |
| SUSE Manager Retail Branch Server 4.0 | clamav | 0.103.2-3.26.1 | SUSE-SU-2021:1190-1 |
| SUSE Manager Proxy 4.0 | clamav | 0.103.2-3.26.1 | SUSE-SU-2021:1190-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | clamav | 0.103.2-0.20.35.1 | SUSE-SU-2021:14692-1 |
| SUSE HPE Helion OpenStack 8 | clamav | 0.103.2-33.35.1 | SUSE-SU-2021:1189-1 |
| SUSE Enterprise Storage 6 | clamav | 0.103.2-3.26.1 | SUSE-SU-2021:1190-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | clamav | 0.103.3-1.4 | openSUSE-SU-2024:10685-1 |
| openSUSE Leap 15.2 | clamav | 0.103.2-lp152.6.6.1 | openSUSE-SU-2021:0555-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | clamav | 0.103.2-r0 | — |
| Alpine v3.23 | clamav | 0.103.2-r0 | — |
| Alpine v3.22 | clamav | 0.103.2-r0 | — |
| Alpine v3.21 | clamav | 0.103.2-r0 | — |
| Alpine v3.20 | clamav | 0.103.2-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | clamav | 0.103.2-r0 | — |
| Alpine v3.18 | clamav | 0.103.2-r0 | — |
| Alpine v3.17 | clamav | 0.103.2-r0 | — |
| Alpine v3.16 | clamav | 0.103.2-r0 | — |
| Alpine v3.15 | clamav | 0.103.2-r0 | — |
| Alpine v3.14 | clamav | 0.103.2-r0 | — |
| Alpine v3.13 | clamav | 0.103.2-r0 | — |
| Alpine v3.12 | clamav | 0.103.2-r0 | — |
| Alpine v3.11 | clamav | 0.103.2-r0 | — |
Advisories 9
- USN-4918-2 clamav vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4918-1 clamav vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-2626-1 clamav - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:1174-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0555-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10685-1 clamav-0.103.3-1.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1190-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1189-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14692-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://blog.clamav.net/2021/04/clamav-01032-security-patch-release.html vendor-advisory
- [debian-lts-announce] 20210414 [SECURITY] [DLA 2626-1] clamav security update mailing-list
- GLSA-202104-07 vendor-advisory