HOMEVULNERABILITIESCVE-2003-0870
HIGHPOC

CVE-2003-0870

CWE-787Published: November 17, 2003· Updated: Jun 16, 2026

7.5
CVSS v3.1

Official Description

Heap-based buffer overflow in Opera 7.11 and 7.20 allows remote attackers to execute arbitrary code via an HREF with a large number of escaped characters in the server name.

NVD Source

Technical Analysis

CVE-2003-0870 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2003-0870. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityP
IntegrityP
AvailabilityP
AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected Vendors & Products

opera1 product(s)
opera browser
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://www.atstake.com/research/advisories/2003/a102003-1.txt
PATCHhttp://www.securityfocus.com/bid/8853
PATCHhttp://www.atstake.com/research/advisories/2003/a102003-1.txt
PATCHhttp://www.securityfocus.com/bid/8853
ADVISORYhttps://exchange.xforce.ibmcloud.com/vulnerabilities/13458
ADVISORYhttps://exchange.xforce.ibmcloud.com/vulnerabilities/13458

All References (8)

→
http://archives.neohapsis.com/archives/vulnwatch/2003-q4/0016.htmlBroken Link
→
http://www.atstake.com/research/advisories/2003/a102003-1.txtExploit · Patch · Vendor Advisory
→
http://www.securityfocus.com/bid/8853Broken Link · Exploit · Patch · Third Party Advisory · VDB Entry · Vendor Advisory
→
https://exchange.xforce.ibmcloud.com/vulnerabilities/13458Third Party Advisory · VDB Entry
→
http://archives.neohapsis.com/archives/vulnwatch/2003-q4/0016.htmlBroken Link
→
http://www.atstake.com/research/advisories/2003/a102003-1.txtExploit · Patch · Vendor Advisory
→
http://www.securityfocus.com/bid/8853Broken Link · Exploit · Patch · Third Party Advisory · VDB Entry · Vendor Advisory
→
https://exchange.xforce.ibmcloud.com/vulnerabilities/13458Third Party Advisory · VDB Entry

Quick Facts

CVE IDCVE-2003-0870
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-787
CISA KEVNo
ExploitPOC
Affected1 vendor(s)
PublishedNov 17, 2003

Related CVEs (CWE-787)

CVE-2014-1478
10.0
CVE-2013-5610
10.0
CVE-2011-1807
10.0
CVE-2012-0751
10.0
CVE-2012-3957
10.0
CVE-2015-5105
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2003-0870 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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