PatchTheCVECVE-2025-34522: A heap-based buffer overflow vulnerability exists in the input parsing logic of Arcserve Unified Data Protecti
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CRITICAL 9.8REMOTEUPGRADE
CVE-2025-34522 is a critical-severity flaw (CVSS 9.8) affecting udp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A heap-based buffer overflow vulnerability exists in the input parsing logic of Arcserve Unified Data Protection (UDP). This flaw can be triggered without authentication by sending specially crafted input to the target system. Improper bounds checking allows an attacker to overwrite heap memory, potentially leading to application crashes or remote code execution. Exploitation occurs in the context of the affected process and does not require user
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.6% (top 54%) |
| CISA exploited list | No |
| Weakness | CWE-122 |
| Published | 2025-08-27 |
| Last modified | 2026-10-23 |
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
arcserve udp UPGRADE
Affected: < 7.0 · >= 8.0 and < 10.2 · 7.0 · 7.0 update_1 · 7.0 update_2
Fixed in: 7.0, 10.2
Safe to downgrade to: a release before 7.0
1. Check installed version
apt-cache policy udp || rpm -q udp || udp --version
2. UPGRADE to 7.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade udp
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade udp
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 7.0 (Debian / Ubuntu)
apt-cache madison udp
sudo apt install udp=<VERSION_BEFORE_7.0>
sudo apt-mark hold udp
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list udp
sudo dnf downgrade udp-<VERSION_BEFORE_7.0>
sudo dnf versionlock add udp
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.
Exact fixes by distribution
Fedora 46 · pspp · FIXED · 2.1.3-2.fc46 · FEDORA-2026-0d6444911b · source
sudo dnf upgrade --advisory=FEDORA-2026-0d6444911b
Fedora ELN · barman · FIXED · 3.20.1-3.eln159 · FEDORA-2026-45ecf042c2 · source
sudo dnf upgrade --advisory=FEDORA-2026-45ecf042c2
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.