CVE-2019-3821: A flaw was found in the way civetweb frontend was handling requests for ceph RGW server with SSL enabled

Q: How do I fix CVE-2019-3821?

civetweb: upgrade to 1.11; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2019-3821 being exploited?

CVE-2019-3821 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-3821 affect?

CVE-2019-3821 affects civetweb, ubuntu linux. Severity is high (CVSS 7.5). A flaw was found in the way civetweb frontend was handling requests for ceph RGW server with SSL enabled. An unauthenticated attacker could create multiple connections to ceph RADOS gateway to exhaust file descriptors for ceph-radosgw servi

Q: How urgent is CVE-2019-3821?

Priority 58/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2019-3821 is a high-severity flaw (CVSS 7.5) affecting civetweb, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in the way civetweb frontend was handling requests for ceph RGW server with SSL enabled. An unauthenticated attacker could create multiple connections to ceph RADOS gateway to exhaust file descriptors for ceph-radosgw service resulting in a remote denial of service.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-772
Published	2019-03-27
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: canonical · ceph

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

Am I affected?

Timeline

2019-03-27 13:29 UTCPublished CVE record published
2026-06-17 02:35 UTCUpdated Record last modified

ceph civetweb UPGRADE

Affected: < 1.11

Fixed in: 1.11

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade civetweb

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade civetweb

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

canonical ubuntu linux MITIGATE

Affected: 16.04 · 18.10 · 19.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 16.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2019-3821?

civetweb: upgrade to 1.11; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-3821 being exploited?

CVE-2019-3821 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-2019-3821 affect?

CVE-2019-3821 affects civetweb, ubuntu linux. Severity is high (CVSS 7.5). A flaw was found in the way civetweb frontend was handling requests for ceph RGW server with SSL enabled. An unauthenticated attacker could create multiple connections to ceph RADOS gateway to exhaust file descriptors for ceph-radosgw servi

How urgent is CVE-2019-3821?

Priority 58/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Ubuntu vulnerabilities · Ceph vulnerabilities

Related CVEs

CVE-2026-5789 HIGH 7.8 DOWNGRADE Vulnerability related to an unquoted search path in CivetWeb v1.16
CVE-2025-55763 HIGH 7.5 UPGRADE Buffer Overflow in the URI parser of CivetWeb 1.14 through 1.16 (latest) allows a remote attacker to achieve r
CVE-2020-27304 CRITICAL 9.8 UPGRADE UPGRADE The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when u
CVE-2018-12684 HIGH 7.1 UPGRADE Out-of-bounds Read in the send_ssi_file function in civetweb.c in CivetWeb through 1.10 allows attackers to ca

References

← Back to latest CVEs