PatchTheCVECVE-2004-0193: Heap-based buffer overflow in the ISS Protocol Analysis Module (PAM), as used in certain versions of RealSecur
50
This month
HIGH 7.5DOWNGRADEDOWNGRADEDOWNGRADE
CVE-2004-0193 is a high-severity flaw (CVSS 7.5) affecting blackice agent server, blackice pc protection, blackice server protection. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Heap-based buffer overflow in the ISS Protocol Analysis Module (PAM), as used in certain versions of RealSecure Network 7.0 and Server Sensor 7.0, Proventia A, G, and M Series, RealSecure Desktop 7.0 and 3.6, RealSecure Guard 3.6, RealSecure Sentry 3.6, BlackICE PC Protection 3.6, and BlackICE Server Protection 3.6, allows remote attackers to execute arbitrary code via an SMB packet containing an authentication request with a long username.
Why this priority
- High severity
- EPSS top 5%: very likely to be exploited
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 7.5 (High) |
| EPSS exploit chance | 8.0% (top 5%) |
| CISA exploited list | No |
| Published | 2004-03-15 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
iss blackice agent server DOWNGRADE
Affected: 3.6eca
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.6eca
1. Check installed version
apt-cache policy blackice-agent-server || rpm -q blackice-agent-server || blackice-agent-server --version
2. No fixed release: DOWNGRADE to a release before 3.6eca (Debian / Ubuntu)
apt-cache madison blackice-agent-server
sudo apt install blackice-agent-server=<VERSION_BEFORE_3.6eca>
sudo apt-mark hold blackice-agent-server
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list blackice-agent-server
sudo dnf downgrade blackice-agent-server-<VERSION_BEFORE_3.6eca>
sudo dnf versionlock add blackice-agent-server
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
iss blackice pc protection DOWNGRADE
Affected: 3.6cbd
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.6cbd
1. Check installed version
apt-cache policy blackice-pc-protection || rpm -q blackice-pc-protection || blackice-pc-protection --version
2. No fixed release: DOWNGRADE to a release before 3.6cbd (Debian / Ubuntu)
apt-cache madison blackice-pc-protection
sudo apt install blackice-pc-protection=<VERSION_BEFORE_3.6cbd>
sudo apt-mark hold blackice-pc-protection
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list blackice-pc-protection
sudo dnf downgrade blackice-pc-protection-<VERSION_BEFORE_3.6cbd>
sudo dnf versionlock add blackice-pc-protection
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
iss blackice server protection DOWNGRADE
Affected: 3.6cbz
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.6cbz
1. Check installed version
apt-cache policy blackice-server-protection || rpm -q blackice-server-protection || blackice-server-protection --version
2. No fixed release: DOWNGRADE to a release before 3.6cbz (Debian / Ubuntu)
apt-cache madison blackice-server-protection
sudo apt install blackice-server-protection=<VERSION_BEFORE_3.6cbz>
sudo apt-mark hold blackice-server-protection
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list blackice-server-protection
sudo dnf downgrade blackice-server-protection-<VERSION_BEFORE_3.6cbz>
sudo dnf versionlock add blackice-server-protection
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
iss realsecure desktop DOWNGRADE
Affected: 3.6eca · 3.6ecf · 7.0ebg · 7.0epk
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.6eca
1. Check installed version
apt-cache policy realsecure-desktop || rpm -q realsecure-desktop || realsecure-desktop --version
2. No fixed release: DOWNGRADE to a release before 3.6eca (Debian / Ubuntu)
apt-cache madison realsecure-desktop
sudo apt install realsecure-desktop=<VERSION_BEFORE_3.6eca>
sudo apt-mark hold realsecure-desktop
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list realsecure-desktop
sudo dnf downgrade realsecure-desktop-<VERSION_BEFORE_3.6eca>
sudo dnf versionlock add realsecure-desktop
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
iss realsecure guard DOWNGRADE
Affected: 3.6ecb
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.6ecb
1. Check installed version
apt-cache policy realsecure-guard || rpm -q realsecure-guard || realsecure-guard --version
2. No fixed release: DOWNGRADE to a release before 3.6ecb (Debian / Ubuntu)
apt-cache madison realsecure-guard
sudo apt install realsecure-guard=<VERSION_BEFORE_3.6ecb>
sudo apt-mark hold realsecure-guard
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list realsecure-guard
sudo dnf downgrade realsecure-guard-<VERSION_BEFORE_3.6ecb>
sudo dnf versionlock add realsecure-guard
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
iss realsecure network DOWNGRADE
Affected: 7.0 xpu_20.15
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.0
1. Check installed version
apt-cache policy realsecure-network || rpm -q realsecure-network || realsecure-network --version
2. No fixed release: DOWNGRADE to a release before 7.0 (Debian / Ubuntu)
apt-cache madison realsecure-network
sudo apt install realsecure-network=<VERSION_BEFORE_7.0>
sudo apt-mark hold realsecure-network
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list realsecure-network
sudo dnf downgrade realsecure-network-<VERSION_BEFORE_7.0>
sudo dnf versionlock add realsecure-network
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2004-0193?
blackice agent server: downgrade or apply the listed mitigation; blackice pc protection: downgrade or apply the listed mitigation; blackice server protection: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2004-0193 being exploited?
CVE-2004-0193 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2004-0193 affect?
CVE-2004-0193 affects blackice agent server, blackice pc protection, blackice server protection. Severity is high (CVSS 7.5). Heap-based buffer overflow in the ISS Protocol Analysis Module (PAM), as used in certain versions of RealSecure Network 7.0 and Server Sensor 7.0, Proventia A, G, and M Series, RealSecure Desktop 7.0 and 3.6, RealSecure Guard 3.6, RealSecur
How urgent is CVE-2004-0193?
Priority 50/100. High severity; EPSS top 5%: very likely to be exploited
Related CVEs
- CVE-2005-2711 HIGH 7.2 MITIGATE DOWNGRADE ISS BlackIce 3.6, as used in multiple products including BlackICE PC Protection, Server Protection, Agent for
- CVE-2004-2125 MEDIUM 4.6 DOWNGRADE DOWNGRADE Buffer overflow in blackd.exe for BlackICE PC Protection 3.6 and other versions before 3.6.ccb, with applicati
- CVE-2004-0362 HIGH 7.5 DOWNGRADE DOWNGRADE Multiple stack-based buffer overflows in the ICQ parsing routines of the ISS Protocol Analysis Module (PAM) co