Description
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.
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 | libvncserver | 0.9.11+dfsg-1.3 | — |
| Debian 13 | libvncserver | 0.9.11+dfsg-1.3 | — |
| Debian 13 | veyon | 4.1.7+repack1-1 | — |
| Debian 12 | libvncserver | 0.9.11+dfsg-1.3 | — |
| Debian 12 | veyon | 4.1.7+repack1-1 | — |
| Debian 8 | italc | 1:2.0.2+dfsg1-2+deb8u1 | DLA-1979-1 |
| Debian 8 | libvncserver | 0.9.9+dfsg2-6.1+deb8u5 | DLA-1652-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tightvnc | No fix yet | — |
| Ubuntu 26.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 25.10 | tightvnc | No fix yet | — |
| Ubuntu 24.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 22.04 LTS | tightvnc | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 18.04 LTS | italc | 1:3.0.3+dfsg1-3ubuntu0.1 | USN-4547-1 |
| Ubuntu 18.04 LTS | libvncserver | 0.9.11+dfsg-1ubuntu1.1 | USN-3877-1 |
| Ubuntu 18.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 16.04 LTS | italc | 1:2.0.2+dfsg1-4ubuntu0.1 | USN-4587-1 |
| Ubuntu 16.04 LTS | libvncserver | 0.9.10+dfsg-3ubuntu0.16.04.3 | USN-3877-1 |
| Ubuntu 16.04 LTS | tightvnc | No fix yet | — |
| Ubuntu 14.04 LTS | libvncserver | 0.9.9+dfsg-1ubuntu1.4 | USN-3877-1 |
| Ubuntu Pro 14.04 LTS | tightvnc | 1.3.9-6.5+deb8u1build0.14.04.1~esm1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | LibVNCServer | 0.9.10-4.6.1 | SUSE-SU-2019:0283-1 |
| SLES 12 SP4 | LibVNCServer | 0.9.9-17.11.1 | SUSE-SU-2019:0313-1 |
| SLES 12 SP3 | LibVNCServer | 0.9.9-17.11.1 | SUSE-SU-2019:0313-1 |
| SLES 12 SP2 | LibVNCServer | 0.9.9-17.11.1 | SUSE-SU-2019:0313-1 |
| SLES 12 SP1 | LibVNCServer | 0.9.9-17.11.1 | SUSE-SU-2019:0313-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | LibVNCServer | 0.9.9-17.11.1 | SUSE-SU-2019:0313-1 |
| SLES 11 SP4 | LibVNCServer | 0.9.1-160.9.1 | SUSE-SU-2019:13952-1 |
| SLES for SAP 12 SP4 | LibVNCServer | 0.9.9-17.11.1 | SUSE-SU-2019:0313-1 |
| SLES for SAP 12 SP3 | LibVNCServer | 0.9.9-17.11.1 | SUSE-SU-2019:0313-1 |
| SLES for SAP 12 SP2 | LibVNCServer | 0.9.9-17.11.1 | SUSE-SU-2019:0313-1 |
| SLES for SAP 12 SP1 | LibVNCServer | 0.9.9-17.11.1 | SUSE-SU-2019:0313-2 |
| SLES for SAP 11 SP4 | LibVNCServer | 0.9.1-160.9.1 | SUSE-SU-2019:13952-1 |
| SUSE OpenStack Cloud 7 | LibVNCServer | 0.9.9-17.11.1 | SUSE-SU-2019:0313-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | LibVNCServer | 0.9.1-160.9.1 | SUSE-SU-2019:13952-1 |
| SUSE Enterprise Storage 4 | LibVNCServer | 0.9.9-17.11.1 | SUSE-SU-2019:0313-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.0 | LibVNCServer | 0.9.10-lp150.3.6.1 | openSUSE-SU-2019:0196-1 |
Advisories 12
- USN-4547-1 italc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4587-1 italc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-3877-1 libvncserver vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-1652-1 libvncserver - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1979-1 italc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:0283-1 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:0196-1 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:13952-1 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0313-1 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0313-2 Security update for LibVNCServer SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-21-350-12 Siemens SIMATIC ITC CISA ICS & IT advisories · May 6, 2025
- SSA-390195 SSA-390195: LibVNC Vulnerabilities in SIMATIC ITC Products Siemens ProductCERT · Dec 14, 2021
References
- [debian-lts-announce] 20190131 [SECURITY] [DLA 1652-1] libvncserver security update mailing-list
- https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42bae
- https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2c
- https://github.com/LibVNC/libvncserver/issues/273
- https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b92757bc2a
- https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7
- USN-3877-1 vendor-advisory
- https://www.openwall.com/lists/oss-security/2018/12/10/8
- [debian-lts-announce] 20191030 [SECURITY] [DLA 1979-1] italc security update mailing-list
- USN-4547-1 vendor-advisory
- USN-4587-1 vendor-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf