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Netweaver As Internet Graphics ServerApplication · Sap

CVE-2021-27620

MEDIUM · 5.9 CVSS v3.1 Published 2021-06-09
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
SAP Internet Graphics Service, versions - 7.20,7.20EXT,7.53,7.20_EX2,7.81, allows an unauthenticated attacker after retrieving an existing system state value can submit a malicious IGS request over a network which due to insufficient input validation in method Ups::AddPart() which will trigger an internal memory corruption error in the system causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

SAP Internet Graphics Service contains a denial-of-service vulnerability where insufficient input validation in the Ups::AddPart() method allows unauthenticated attackers to submit malicious IGS requests that trigger memory corruption, causing the system to crash and become unavailable.

MitigationApply the relevant SAP security patch for CVE-2021-27620 and restrict network access to IGS services to mitigate unauthenticated exploitation attempts.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Netweaver As Internet Graphics ServerApplication
Affected:= 7.20= 7.20ex2= 7.20ext= 7.53= 7.81

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm SAP IGS component is installed
    Check for SAP Internet Graphics Service by viewing running SAP processes via transaction SM51 (Server Overview) or by checking for IGS-related processes on the server (typically igsdaemon, igswd, or sapigssrv processes)
    Affected if IGS processes or services are running on the system
  2. Identify the SAP Netweaver AS Internet Graphics Server version
    Run transaction SM51, select the application server, and check the kernel version details. Alternatively, check the SAP kernel version using the 'sapkernel' executable version or via transaction 'SPAM' (Support Package Manager) to view installed components
    Affected if The installed version matches 7.20, 7.20ex2, 7.20ext, 7.53, or 7.81
  3. Check for IGS-specific version information
    Use SAP transaction SE37 (Function Module) to view function module IGS_VERSION_GET or check the IGS web service endpoint (typically /sap/bc/igs) for version disclosure
    Affected if The IGS version returned matches any of the affected versions listed
  4. Verify IGS HTTP service is network accessible
    Check network configuration and firewall rules for ports used by IGS (commonly port 8000 or configured HTTP port). Use netstat or ss to list listening ports and identify if IGS HTTP listener is exposed to untrusted networks
    Affected if IGS HTTP service port is listening and accessible from untrusted/network segments without authentication requirements
  5. Check for recent IGS-related crash logs
    Review SAP system logs via transaction SM37 (Job Log) or check operating system logs for IGS process terminations. Look for entries showing igs_* processes crashing with memory corruption indicators
    Affected if Recent logs show IGS process crashes or memory corruption events with no other known cause

The environment is affected if SAP Internet Graphics Service is running and the installed version matches 7.20, 7.20ex2, 7.20ext, 7.53, or 7.81, particularly if the IGS HTTP interface is network-accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the relevant SAP security patch for CVE-2021-27620 and restrict network access to IGS services to mitigate unauthenticated exploitation attempts.

Fix this in Netweaver As Internet Graphics Server Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,280
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-27620 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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