CVE-2018-6653: comforte SWAP 1049 through 1069 and 20.0.0 through 21.5.3 (as used in SSLOBJ on HPE NonStop SSL T0910, and in

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2018-6653 is a medium-severity flaw (CVSS 5.3) affecting swap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

comforte SWAP 1049 through 1069 and 20.0.0 through 21.5.3 (as used in SSLOBJ on HPE NonStop SSL T0910, and in the comforte SecurCS, SecurFTP, SecurLib/SSL-AT, and SecurTN products), after executing the RELOAD CERTIFICATES command, does not ensure that clients use a strong TLS cipher suite, which makes it easier for remote attackers to defeat intended cryptographic protection mechanisms by sniffing the network. This is fixed in 21.6.0.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-326
Published	2018-03-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: comforte

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

Am I affected?

Timeline

2018-03-01 00:29 UTCPublished CVE record published
2026-06-17 02:02 UTCUpdated Record last modified

comforte swap UPGRADE

Affected: >= 20.0.0 and <= 21.5.3 · >= 1049 and <= 1069

Fixed in: newer than 1069

Safe to downgrade to: a release before 20.0.0

1. Check installed version

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

2. UPGRADE to newer than 1069 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade swap

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 20.0.0 (Debian / Ubuntu)

apt-cache madison swap sudo apt install swap=<VERSION_BEFORE_20.0.0> sudo apt-mark hold swap

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list swap sudo dnf downgrade swap-<VERSION_BEFORE_20.0.0> sudo dnf versionlock add swap

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-2018-6653?

swap: upgrade to newer than 1069. Exact commands for each OS are on this page.

Is CVE-2018-6653 being exploited?

CVE-2018-6653 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-2018-6653 affect?

CVE-2018-6653 affects swap. Severity is medium (CVSS 5.3). comforte SWAP 1049 through 1069 and 20.0.0 through 21.5.3 (as used in SSLOBJ on HPE NonStop SSL T0910, and in the comforte SecurCS, SecurFTP, SecurLib/SSL-AT, and SecurTN products), after executing the RELOAD CERTIFICATES command, does not

How urgent is CVE-2018-6653?

Priority 32/100. Remotely exploitable, no login, no user action

References

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