CVE-2017-15998: In the "NQ Contacts Backup & Restore" application 1.1 for Android, DES encryption with a static key is used to

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HIGH 7.5REMOTEDOWNGRADE

CVE-2017-15998 is a high-severity flaw (CVSS 7.5) affecting contacts backup \& restore. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the "NQ Contacts Backup & Restore" application 1.1 for Android, DES encryption with a static key is used to secure transmitted contact data. This makes it easier for remote attackers to obtain cleartext information by sniffing the network.

Why this priority

High severity
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	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-327
Published	2017-10-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nq

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

Am I affected?

Timeline

2017-10-29 17:29 UTCPublished CVE record published
2026-06-17 01:08 UTCUpdated Record last modified

nq contacts backup \& restore DOWNGRADE

Affected: 1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

1. Check installed version

apt-cache policy contacts-backup--restore || rpm -q contacts-backup--restore || contacts-backup--restore --version

2. No fixed release: DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison contacts-backup--restore sudo apt install contacts-backup--restore=<VERSION_BEFORE_1.1> sudo apt-mark hold contacts-backup--restore

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

dnf --showduplicates list contacts-backup--restore sudo dnf downgrade contacts-backup--restore-<VERSION_BEFORE_1.1> sudo dnf versionlock add contacts-backup--restore

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-2017-15998?

contacts backup \& restore: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-15998 being exploited?

CVE-2017-15998 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-2017-15998 affect?

CVE-2017-15998 affects contacts backup \& restore. Severity is high (CVSS 7.5). In the "NQ Contacts Backup & Restore" application 1.1 for Android, DES encryption with a static key is used to secure transmitted contact data. This makes it easier for remote attackers to obtain cleartext information by sniffing the networ

How urgent is CVE-2017-15998?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Software pages

Android vulnerabilities

Related CVEs

CVE-2017-15999 CRITICAL 9.8 DOWNGRADE In the "NQ Contacts Backup & Restore" application 1.1 for Android, no HTTPS is used for transmitting login and
CVE-2017-15997 HIGH 7.8 DOWNGRADE In the "NQ Contacts Backup & Restore" application 1.1 for Android, RC4 encryption is used to secure the user p

References

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