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CVE-2022-27779: libcurl wrongly allows cookies to be set for Top Level Domains (TLDs) if thehost name is provided with a trail

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This week
MEDIUM 5.3REMOTEUPGRADEMITIGATEMITIGATE

CVE-2022-27779 is a medium-severity flaw (CVSS 5.3) affecting curl, hci bootstrap os, clustered data ontap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libcurl wrongly allows cookies to be set for Top Level Domains (TLDs) if thehost name is provided with a trailing dot.curl can be told to receive and send cookies. curl's "cookie engine" can bebuilt with or without [Public Suffix List](https://publicsuffix.org/)awareness. If PSL support not provided, a more rudimentary check exists to atleast prevent cookies from being set on TLDs. This check was broken if thehost name in the URL uses a trailing

Why this priority

  • Public exploit reference
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score5.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance2.8% (top 14%)
CISA exploited listNo
WeaknessCWE-201
Published2022-06-02
Last modified2026-11-02
Publisher (CNA): HackerOne · Vendor: haxx · netapp

Share: LinkedIn · X · Reddit

Last updated 2026-11-02 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

haxx curl UPGRADE
Affected: >= 7.82.0 and < 7.83.1
Fixed in: 7.83.1
Safe to downgrade to: a release before 7.82.0
1. Check installed version
apt-cache policy curl || rpm -q curl || curl --version
2. UPGRADE to 7.83.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade curl
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade curl
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 7.82.0 (Debian / Ubuntu)
apt-cache madison curl sudo apt install curl=<VERSION_BEFORE_7.82.0> sudo apt-mark hold curl
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list curl sudo dnf downgrade curl-<VERSION_BEFORE_7.82.0> sudo dnf versionlock add curl
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.
netapp hci bootstrap os MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
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.
netapp clustered data ontap MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy clustered-data-ontap || rpm -q clustered-data-ontap || clustered-data-ontap --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp solidfire\, enterprise sds \& hci storage node MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy solidfire-enterprise-sds--hci-storage-node || rpm -q solidfire-enterprise-sds--hci-storage-node || solidfire-enterprise-sds--hci-storage-node --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp solidfire \& hci management node MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy solidfire--hci-management-node || rpm -q solidfire--hci-management-node || solidfire--hci-management-node --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp hci compute node MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
Firmware
Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.
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-2022-27779?

curl: upgrade to 7.83.1; hci bootstrap os: mitigate or apply the listed mitigation; clustered data ontap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-27779 being exploited?

CVE-2022-27779 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-2022-27779 affect?

CVE-2022-27779 affects curl, hci bootstrap os, clustered data ontap. Severity is medium (CVSS 5.3). libcurl wrongly allows cookies to be set for Top Level Domains (TLDs) if thehost name is provided with a trailing dot.curl can be told to receive and send cookies. curl's "cookie engine" can bebuilt with or without [Public Suffix List](http

How urgent is CVE-2022-27779?

Priority 50/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

curl vulnerabilities · Bootstrap vulnerabilities

Related CVEs

References

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