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CVE-2007-0342: WebCore in Apple WebKit build 18794 allows remote attackers to cause a denial of service (null dereference and

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This week
HIGH 7.5REMOTEDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2007-0342 is a high-severity flaw (CVSS 7.5) affecting safari, webkit, omniweb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WebCore in Apple WebKit build 18794 allows remote attackers to cause a denial of service (null dereference and application crash) via a TD element with a large number in the ROWSPAN attribute, as demonstrated by a crash of OmniWeb 5.5.3 on Mac OS X 10.4.8, a different vulnerability than CVE-2006-2019.

Why this priority

  • High severity
  • EPSS top 8%: very likely to be exploited
  • Public exploit reference
  • Remotely exploitable, no login, no user action

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

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance4.6% (top 8%)
CISA exploited listNo
WeaknessCWE-399, CWE-476
Published2007-01-18
Last modified2026-06-16
Publisher (CNA): MITRE · Vendor: apple · omnigroup

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Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

apple safari DOWNGRADE
Affected: 2.0.4_419.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.0.4_419.3
1. Check installed version
apt-cache policy safari || rpm -q safari || safari --version
2. No fixed release: DOWNGRADE to a release before 2.0.4_419.3 (Debian / Ubuntu)
apt-cache madison safari sudo apt install safari=<VERSION_BEFORE_2.0.4_419.3> sudo apt-mark hold safari
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list safari sudo dnf downgrade safari-<VERSION_BEFORE_2.0.4_419.3> sudo dnf versionlock add safari
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.
apple webkit DOWNGRADE
Affected: build_18794
Fixed in: no fixed release known
Safe to downgrade to: a release before build_18794
1. Check installed version
apt-cache policy webkit || rpm -q webkit || webkit --version
2. No fixed release: DOWNGRADE to a release before build_18794 (Debian / Ubuntu)
apt-cache madison webkit sudo apt install webkit=<VERSION_BEFORE_build_18794> sudo apt-mark hold webkit
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list webkit sudo dnf downgrade webkit-<VERSION_BEFORE_build_18794> sudo dnf versionlock add webkit
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.
omnigroup omniweb DOWNGRADE
Affected: 5.5.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 5.5.3
1. Check installed version
apt-cache policy omniweb || rpm -q omniweb || omniweb --version
2. No fixed release: DOWNGRADE to a release before 5.5.3 (Debian / Ubuntu)
apt-cache madison omniweb sudo apt install omniweb=<VERSION_BEFORE_5.5.3> sudo apt-mark hold omniweb
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list omniweb sudo dnf downgrade omniweb-<VERSION_BEFORE_5.5.3> sudo dnf versionlock add omniweb
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.
apple mac os x MITIGATE
Affected: 10.4.8
Fixed in: no fixed release known
Safe to downgrade to: a release before 10.4.8
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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

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-2007-0342?

safari: downgrade or apply the listed mitigation; webkit: downgrade or apply the listed mitigation; omniweb: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2007-0342 being exploited?

CVE-2007-0342 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-2007-0342 affect?

CVE-2007-0342 affects safari, webkit, omniweb. Severity is high (CVSS 7.5). WebCore in Apple WebKit build 18794 allows remote attackers to cause a denial of service (null dereference and application crash) via a TD element with a large number in the ROWSPAN attribute, as demonstrated by a crash of OmniWeb 5.5.3 on

How urgent is CVE-2007-0342?

Priority 59/100. High severity; EPSS top 8%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Safari vulnerabilities · WebKit vulnerabilities · Apple Safari and WebKit vulnerabilities

Related CVEs

References

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