CVE-2021-27620Network attack vector

Service crash via unchecked packet counter

Published Jun 9, 2021 · Updated Aug 3, 2024

Out-of-bounds read in SAP Internet Graphics Service 7.20, 7.20EXT, 7.20_EX2, 7.53, and 7.81 allows remote attackers to crash the service. Ups::AddPart in the IGS portwatcher uses packet data directly as a movs instruction counter, causing memory to be read beyond its bounds. Exploitation requires retrieval of an existing system-state value and a crafted IGS request; it interrupts availability without reading or changing data.

CVSS severity5.9
Medium
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in SAP Internet Graphics Service 7.20, 7.20EXT, 7.20_EX2, 7.53, and 7.81 allows remote attackers to crash the service. Ups::AddPart in the IGS portwatcher uses packet data directly as a movs instruction counter, causing memory to be read beyond its bounds. Exploitation requires retrieval of an existing system-state value and a crafted IGS request; it interrupts availability without reading or changing data.

The record

CVE
CVE-2021-27620
Published
Jun 9, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP Internet Graphics Service
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 7.20
  2. Affected versionversion=< 7.20_EX2
  3. Affected versionversion=< 7.20EXT
  4. Affected versionversion=< 7.53
  5. Affected versionversion=< 7.81

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP Internet Graphics Serviceversion=< 7.20; version=< 7.20_EX2; version=< 7.20EXT; version=< 7.53; version=< 7.81

Published CVSS scores

5.9SAP SECVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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