CVE-2021-47752: AWebServer GhostBuilding 18 contains a denial of service vulnerability that allows remote attackers to overwhe

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2021-47752 is a high-severity flaw (CVSS 7.5) affecting awebserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

AWebServer GhostBuilding 18 contains a denial of service vulnerability that allows remote attackers to overwhelm the server by sending multiple concurrent HTTP requests. Attackers can generate high-volume requests to multiple endpoints including /mysqladmin to potentially crash or render the service unresponsive.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-01-15
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: sylkat-tools

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

Am I affected?

Timeline

2026-01-15 16:16 UTCPublished CVE record published
2026-06-17 04:18 UTCUpdated Record last modified

sylkat-tools awebserver DOWNGRADE

Affected: 18

Fixed in: no fixed release known

Safe to downgrade to: a release before 18

1. Check installed version

apt-cache policy awebserver || rpm -q awebserver || awebserver --version

2. No fixed release: DOWNGRADE to a release before 18 (Debian / Ubuntu)

apt-cache madison awebserver sudo apt install awebserver=<VERSION_BEFORE_18> sudo apt-mark hold awebserver

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

dnf --showduplicates list awebserver sudo dnf downgrade awebserver-<VERSION_BEFORE_18> sudo dnf versionlock add awebserver

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-2021-47752?

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

Is CVE-2021-47752 being exploited?

CVE-2021-47752 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-2021-47752 affect?

CVE-2021-47752 affects awebserver. Severity is high (CVSS 7.5). AWebServer GhostBuilding 18 contains a denial of service vulnerability that allows remote attackers to overwhelm the server by sending multiple concurrent HTTP requests. Attackers can generate high-volume requests to multiple endpoints incl

How urgent is CVE-2021-47752?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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