CVE-2025-27997: An issue in Blizzard Battle.net v2.40.0.15267 allows attackers to escalate privileges via placing a crafted sh

Routine

HIGH 8.4DOWNGRADE

CVE-2025-27997 is a high-severity flaw (CVSS 8.4) affecting battle.net. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in Blizzard Battle.net v2.40.0.15267 allows attackers to escalate privileges via placing a crafted shell script or executable into the C:\ProgramData directory.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.4 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-427
Published	2025-05-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: blizzard

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-21 16:15 UTCPublished CVE record published
2026-06-17 09:04 UTCUpdated Record last modified

blizzard battle.net DOWNGRADE

Affected: 2.40.0.15267

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.40.0.15267

1. Check installed version

apt-cache policy battle.net || rpm -q battle.net || battle.net --version

2. No fixed release: DOWNGRADE to a release before 2.40.0.15267 (Debian / Ubuntu)

apt-cache madison battle.net sudo apt install battle.net=<VERSION_BEFORE_2.40.0.15267> sudo apt-mark hold battle.net

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list battle.net sudo dnf downgrade battle.net-<VERSION_BEFORE_2.40.0.15267> sudo dnf versionlock add battle.net

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.

Quick answers

How do I fix CVE-2025-27997?

battle.net: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-27997 being exploited?

CVE-2025-27997 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-2025-27997 affect?

CVE-2025-27997 affects battle.net. Severity is high (CVSS 8.4). An issue in Blizzard Battle.net v2.40.0.15267 allows attackers to escalate privileges via placing a crafted shell script or executable into the C:\ProgramData directory.

How urgent is CVE-2025-27997?

Priority 31/100. High severity

References

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