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CVE-2018-18689: The Portable Document Format (PDF) specification does not provide any information regarding the concrete proce

46
This month
MEDIUM 5.3REMOTEDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2018-18689 is a medium-severity flaw (CVSS 5.3) affecting expert pdf ultimate, pdf experte ultimate, foxit reader. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Portable Document Format (PDF) specification does not provide any information regarding the concrete procedure of how to validate signatures. Consequently, a Signature Wrapping vulnerability exists in multiple products. An attacker can use /ByteRange and xref manipulations that are not detected by the signature-validation logic. This affects Foxit Reader before 9.4 and PhantomPDF before 8.3.9 and 9.x before 9.4. It also affects eXpert PDF 12

Why this priority

  • Remotely exploitable, no login, no user action

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

Risk facts

CVSS score5.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance3.6% (top 10%)
CISA exploited listNo
WeaknessCWE-347
Published2021-01-07
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: avanquest · foxitsoftware · gonitro · iskysoft

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

avanquest expert pdf ultimate DOWNGRADE
Affected: 12.0.20
Fixed in: no fixed release known
Safe to downgrade to: a release before 12.0.20
1. Check installed version
apt-cache policy expert-pdf-ultimate || rpm -q expert-pdf-ultimate || expert-pdf-ultimate --version
2. No fixed release: DOWNGRADE to a release before 12.0.20 (Debian / Ubuntu)
apt-cache madison expert-pdf-ultimate sudo apt install expert-pdf-ultimate=<VERSION_BEFORE_12.0.20> sudo apt-mark hold expert-pdf-ultimate
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list expert-pdf-ultimate sudo dnf downgrade expert-pdf-ultimate-<VERSION_BEFORE_12.0.20> sudo dnf versionlock add expert-pdf-ultimate
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.
avanquest pdf experte ultimate DOWNGRADE
Affected: 9.0.270
Fixed in: no fixed release known
Safe to downgrade to: a release before 9.0.270
1. Check installed version
apt-cache policy pdf-experte-ultimate || rpm -q pdf-experte-ultimate || pdf-experte-ultimate --version
2. No fixed release: DOWNGRADE to a release before 9.0.270 (Debian / Ubuntu)
apt-cache madison pdf-experte-ultimate sudo apt install pdf-experte-ultimate=<VERSION_BEFORE_9.0.270> sudo apt-mark hold pdf-experte-ultimate
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list pdf-experte-ultimate sudo dnf downgrade pdf-experte-ultimate-<VERSION_BEFORE_9.0.270> sudo dnf versionlock add pdf-experte-ultimate
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.
foxitsoftware foxit reader DOWNGRADE
Affected: 9.1.0 · 9.2.0.9297 · 9.3.0.10826 · 9.2.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 9.1.0
1. Check installed version
apt-cache policy foxit-reader || rpm -q foxit-reader || foxit-reader --version
2. No fixed release: DOWNGRADE to a release before 9.1.0 (Debian / Ubuntu)
apt-cache madison foxit-reader sudo apt install foxit-reader=<VERSION_BEFORE_9.1.0> sudo apt-mark hold foxit-reader
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list foxit-reader sudo dnf downgrade foxit-reader-<VERSION_BEFORE_9.1.0> sudo dnf versionlock add foxit-reader
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.
gonitro nitro pro DOWNGRADE
Affected: 11.0.3.173
Fixed in: no fixed release known
Safe to downgrade to: a release before 11.0.3.173
1. Check installed version
apt-cache policy nitro-pro || rpm -q nitro-pro || nitro-pro --version
2. No fixed release: DOWNGRADE to a release before 11.0.3.173 (Debian / Ubuntu)
apt-cache madison nitro-pro sudo apt install nitro-pro=<VERSION_BEFORE_11.0.3.173> sudo apt-mark hold nitro-pro
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list nitro-pro sudo dnf downgrade nitro-pro-<VERSION_BEFORE_11.0.3.173> sudo dnf versionlock add nitro-pro
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.
gonitro nitro reader DOWNGRADE
Affected: 5.5.9.2
Fixed in: no fixed release known
Safe to downgrade to: a release before 5.5.9.2
1. Check installed version
apt-cache policy nitro-reader || rpm -q nitro-reader || nitro-reader --version
2. No fixed release: DOWNGRADE to a release before 5.5.9.2 (Debian / Ubuntu)
apt-cache madison nitro-reader sudo apt install nitro-reader=<VERSION_BEFORE_5.5.9.2> sudo apt-mark hold nitro-reader
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list nitro-reader sudo dnf downgrade nitro-reader-<VERSION_BEFORE_5.5.9.2> sudo dnf versionlock add nitro-reader
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.
iskysoft pdf editor 6 DOWNGRADE
Affected: 6.4.2.3521 · 6.6.2.3315 · 6.7.6.3399
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.4.2.3521
1. Check installed version
apt-cache policy pdf-editor-6 || rpm -q pdf-editor-6 || pdf-editor-6 --version
2. No fixed release: DOWNGRADE to a release before 6.4.2.3521 (Debian / Ubuntu)
apt-cache madison pdf-editor-6 sudo apt install pdf-editor-6=<VERSION_BEFORE_6.4.2.3521> sudo apt-mark hold pdf-editor-6
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list pdf-editor-6 sudo dnf downgrade pdf-editor-6-<VERSION_BEFORE_6.4.2.3521> sudo dnf versionlock add pdf-editor-6
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-2018-18689?

expert pdf ultimate: downgrade or apply the listed mitigation; pdf experte ultimate: downgrade or apply the listed mitigation; foxit reader: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-18689 being exploited?

CVE-2018-18689 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-2018-18689 affect?

CVE-2018-18689 affects expert pdf ultimate, pdf experte ultimate, foxit reader. Severity is medium (CVSS 5.3). The Portable Document Format (PDF) specification does not provide any information regarding the concrete procedure of how to validate signatures. Consequently, a Signature Wrapping vulnerability exists in multiple products. An attacker can

How urgent is CVE-2018-18689?

Priority 46/100. Remotely exploitable, no login, no user action

References

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